3 x thermo fans stripped in one trip - GU custom brass radiator 6.5 chev GU

[AB]

Hi Folks,

My brother had a nightmare trip away and we were just wondering if anyone had experienced this or any feedback on what could of possibly caused this?

Gu ute, 6.5 Chev and he recently spent a small fortune on a new custom brass radiator and removed the fan and replaced with 2 x 16" Davies Craig rear thermo fans as he had overheating issues.

Has had them on for a few months now but only around town driving, not much highway use. Prior to the trip everything was running like a dream. Even testing it out on our radiator hill from Yarra Glen was the best it had ever ran.

Long story short, towing his camper up to the Murray doing 110km. Just before Shepparton he noticed the water temp was at 3/4. Pulled over and noticed one of the fans had died.

Thermo fan motor still worked but noticed the plastic mould of the fan blades that wrap around the nut that sits on the shaft of the motor had basically been stripped away. Almost like it had melted around the nut and stripped it.

Another 10 km's down the road and the other fan did the same thing so he was in trouble and car was overheating.

Stopped into shep (Fletches workshop) and checked everything out.

Radiator is brand new, dead straight, the install was done correctly and wired up correctly, etc. No install issue so the only choice was to replace it with another one as he had to keep driving.

There was only one in town so they put that on and another 100km's down the road that one stripped too!

Manufacturer dates are all different (5 months apart).

Has anyone stripped thermo fans before?

We are lost for why this has happened???

It was working fine around town for a couple of months prior but never did long highway work, we cannot find any hit marks on the radiator or thermo shroud or if they may have flexed on high speeds, etc.

[threedogs]

were they used to pull or push the air??
The fans shouldnt be on at 110 maybe they were on and being forced to spin

[AB]

were they used to pull or push the air??

Behind the radiator to pull.

And yes all 3 fans were reversed.

[Sir Roofy]

The way I see it is the thermo fan has been running to long and its own heat from its motor has caused this to happen
running around town on short trips and up the hill dose,nt add up to 100ks straight run

[threedogs]

when do they cut off??

[Sir Roofy]

when do they cut off??

I don't think they did thermostat needs looking at

[Winnie]

These fans should be able to cope with being run 24/7 for sure! Overheating and melting from their own motor would be a HUGE design flaw!

[threedogs]

These fans should be able to cope with being run 24/7 for sure! Overheating and melting from their own motor would be a HUGE design flaw!

They can only spin so fast and 110kph they should be off as you dont need a fan at hwy speeds
I think the fans were on and fighting the air coming through the radiator at 110kph

[AB]

when do they cut off??

I don't know that part mate.

[the evil twin]

Something is really odd about this scenario.

1. The fans should be able to run for hours, no worries at all
2. They must have got freaking hot but how did they get hot if the vehicle did not (until they failed)
3. The fact the replacement only lasted 100 K's but the originals a few months is "interesting"
4. The vehicle should be running cooler at 100 ish along the freeway than around town
5. The faster you go the less load on the fans as the ram air is assisting the spin
unless...
the fans are the wrong way around and they were pushing and the faster the vehicle went for longer the more load was on the fans.

Nothing else makes sense, well not that easily leaps to mind anyway, so I would double check the fan direction of rotation

P.S. I have Davies Craig fans on my tranny cooler and they are always on, sometimes for 18 hours straight less meal stops, had one on my intercooler that used to run for hours at a time and 3 all shitting themselves at once.... nah, something else is wrong

[AB]

Something is really odd about this scenario.

1. The fans should be able to run for hours, no worries at all
2. They must have got freaking hot but how did they get hot if the vehicle did not (until they failed)
3. The fact the replacement only lasted 100 K's but the originals a few months is "interesting"
4. The vehicle should be running cooler at 100 ish along the freeway than around town
5. The faster you go the less load on the fans as the ram air is assisting the spin
unless...
the fans are the wrong way around and they were pushing and the faster the vehicle went for longer the more load was on the fans.

Nothing else makes sense, well not that easily leaps to mind anyway, so I would double check the fan direction of rotation

P.S. I have Davies Craig fans on my tranny cooler and they are always on, sometimes for 18 hours straight less meal stops, had one on my intercooler that used to run for hours at a time and 3 all shitting themselves at once.... nah, something else is wrong

100% on correct way.

We went through a lot of scenarios and checked everything too.

[Winnie]

I wouldn't have thought the fans would have any effect at that speed either but the proof is in the pudding... When the fans stop the car overheats.

[the evil twin]

AB... well, your screwed then... maybe try an Exorcism?

Nah, it has to be something that is drawing heaps of current thru the motor, which is making the armature red hot which is melting the plastic.
Sooo something must be loading the fans down... a LOT... and only at high speed
The fan motors will potentially act as a generator if there is enough residual magnetism (had that issue before today) but I can't quite see how that is a problem in the setup as described.

Winnie... they will still do their thing just should be less load (heat and elec) not more

[the evil twin]

Uummmm... while I do some more sleuthing are they in series or parallel?
Does the A/C do single or both?
etc etc IE the more info the better

[AB]

We checked current at idle and it was correct but yeah interesting one that's for sure.

Now that we are back home we can have a proper look at it and pull the old ones off and pray it has not damaged the brand new radiator!!!

[AB]

Uummmm... while I do some more sleuthing are they in series or parallel?

Parallel mate...

[the evil twin]

Part number? and/or are they Falcon ones or whatever?

[Winnie]

We checked current at idle and it was correct but yeah interesting one that's for sure.

Now that we are back home we can have a proper look at it and pull the old ones off and pray it has not damaged the brand new radiator!!!

Would be interesting to have known the current draw on them just before they failed...

[Maxhead]

Do these fans free spin when turned off or stop? as I wonder if the fans are not switching off when the temp cools down and the air is spinning them to fast causing overheating??
You would think they should be able to handle that tho...hmmm

[AB]

Part number? and/or are they Falcon ones or whatever?

I'll have to get back to you mate, we only just got back, no answer on his phone so he is probably draining the hot water, we haven't showered in a week :)

[AB]

Do these fans free spin when turned off or stop? as I wonder if the fans are not switching off when the temp cools down and the air is spinning them to fast causing overheating??
You would think they should be able to handle that tho...hmmm

I have no idea myself mate, he ended up pulling the fuses when he turned up to camp and it was a crappy cold day today so no need for fans on the way home.

[NissanGQ4.2]

This is from my old man Andy, I asked him to have a look at your post

Our fans do not have a nut holding the fan blade onto the shaft. They are pressed on and there is a wave type clip on the end of the shaft. Some models (I think they were called a pancake design, motor was very thing) did have a nut as the fan blade itself had to be reversed to change the air flow as the motor would only run in one direction. Our fans have the fixed fan blade as the motor direction is reversible by swapping the wires over.

These fans should be able to run all the time with out any problems.

He stated that the water temperature gauge is 3/4 but that does not give any indication what the actual temperature is.

Over heating can also be caused by the bottom radiator hose sucking closed (clasping in on itself). Some vehicles have to have a spring wire coil inside the hose to stop them clasping in on them-self. This is usually cased by high draw (flow) caused by a water pump that is trying to move a lot of water into the motor.

Is he using a water thermostat in the engine. If removed it can cause overheating.

There is a lot of things that can cause over heating is wrong size fans, no fan shrouds to direct air flow, fans set too low on the radiator, air not being directed onto the radiator (that is oncoming air hitting the front of the radiator and being forced under or around the sides) Ignition timing, fuel mixture too lean at high speed .

As in another post the fans could be turning in the wrong direction and the wind pressure is putting a lot of strain on the blades but that should not cause them to melt, but may cause twisting on the shaft nut or clip.

There would have to be a massive of heat on these fan blades to cause any damage to them that is unless there is a fault with the materiel that the fan blades have been made of.

[nissannewby]

It's a 6.5 ..... :p

[AB]

This is from my old man Andy, I asked him to have a look at your post

Our fans do not have a nut holding the fan blade onto the shaft. They are pressed on and there is a wave type clip on the end of the shaft. Some models (I think they were called a pancake design, motor was very thing) did have a nut as the fan blade itself had to be reversed to change the air flow as the motor would only run in one direction. Our fans have the fixed fan blade as the motor direction is reversible by swapping the wires over.

These fans should be able to run all the time with out any problems.

He stated that the water temperature gauge is 3/4 but that does not give any indication what the actual temperature is.

Over heating can also be caused by the bottom radiator hose sucking closed (clasping in on itself). Some vehicles have to have a spring wire coil inside the hose to stop them clasping in on them-self. This is usually cased by high draw (flow) caused by a water pump that is trying to move a lot of water into the motor.

Is he using a water thermostat in the engine. If removed it can cause overheating.

There is a lot of things that can cause over heating is wrong size fans, no fan shrouds to direct air flow, fans set too low on the radiator, air not being directed onto the radiator (that is oncoming air hitting the front of the radiator and being forced under or around the sides) Ignition timing, fuel mixture too lean at high speed .

As in another post the fans could be turning in the wrong direction and the wind pressure is putting a lot of strain on the blades but that should not cause them to melt, but may cause twisting on the shaft nut or clip.

There would have to be a massive of heat on these fan blades to cause any damage to them that is unless there is a fault with the materiel that the fan blades have been made of.

Thanks toddy but yeah it's a 6.5 chev and the viscous has been removed and replaced with the 2 x 16" thermos mounted on/behind the radiator that is what's been chewed.

Fwiw though, after the last one died the only way he made it to camp without cooking the engine was to have the ac on.

The condenser fan made enough difference to not boil.

[the evil twin]

snip...

Fwiw though, after the last one died the only way he made it to camp without cooking the engine was to have the ac on.

The condenser fan made enough difference to not boil.

Now I know your kidding me... 2 X 16 inch Davies Craig won't cool it but a dinky little A/C fan will? :icon_bonk:

Glad I have the Viscous Clutch on my Chevy... I am going to be really interested in what the fix to this one is... :trink13:

[NissanGQ4.2]

Thanks toddy but yeah it's a 6.5 chev and the viscous has been removed and replaced with the 2 x 16" thermos mounted on/behind the radiator that is what's been chewed.

Fwiw though, after the last one died the only way he made it to camp without cooking the engine was to have the ac on.

The condenser fan made enough difference to not boil.

He read it is a 6.5, we are both running twin thermo fans, mine are Davies Craig his are falcon fans even though he did buy the same CD thermo's as mine it was easier 2 put the falcon ones in.

I would be re checking the direction of blades

[Winnie]

Now I know your kidding me... 2 X 16 inch Davies Craig won't cool it but a dinky little A/C fan will? :icon_bonk:

Glad I have the Viscous Clutch on my Chevy... I am going to be really interested in what the fix to this one is... :trink13:

The Davies Craig fans weren't spinning though!

[the evil twin]

The Davies Craig fans weren't spinning though!

The 2nd one was when the vehicle initially went to 3/4's so he pulled up to investigate... and then the 3rd one was when the 2nd one failed.

Like I said, something is really weird... hey, you Vic's haven't stumbled on a cache of 'ludes or something have you... it's only fair to share you know

[threedogs]

I take it no shroud is fitted and fan are fitted directly to the radiator.
Can you find out if they were on a thermostat ?
Did you use paper strips to determine air flow or just a hand,

[big_fletch]

I checked it out when he had got too Shepparton and replaced one of the fans. The Davies Craig fans are plastic with a center metal nut that's basically cast into the fan. The plastic fan blades had basically stripped from this nut with is held too the motor shaft with a clip. Fans run through a separate relay from each fan and triggered by a thermo switch mounted into the top of the radiator.

Both fans are bolted through the radiator. After replacing the fan and checked it was not rubbing on the radiator I checked airflow direction with my hand and then put a piece of paper down too double check myself.

Myself and my Boss are stumped on why it's doing it?? Once the problem is worked out I'm very keen too know what's wrong

Fletcha

[Winnie]

Surely he can not have just got 3 faulty fans?

[the evil twin]

I checked it out when he had got too Shepparton and replaced one of the fans. The Davies Craig fans are plastic with a center metal nut that's basically cast into the fan. The plastic fan blades had basically stripped from this nut with is held too the motor shaft with a clip. Fans run through a separate relay from each fan and triggered by a thermo switch mounted into the top of the radiator.

Both fans are bolted through the radiator. After replacing the fan and checked it was not rubbing on the radiator I checked airflow direction with my hand and then put a piece of paper down too double check myself.

Myself and my Boss are stumped on why it's doing it?? Once the problem is worked out I'm very keen too know what's wrong

Fletcha

Aaaahhhh, the plot thickens Dr Watson,

Curious as to why did you check the airflow with paper and your hand instead of just visually confirming the blade rotation?
I ask purely because airflows can be very deceptive around radiators etc.

Thinking about this again last night I was also wondering if cavitation may be an issue

At least being Davies Craig and only a few months or in the 3rd case, hours old, I'm sure they will make good on any faulty gear.

[threedogs]

I wonder if setting the thermostat [for the fans] lower would help and what value thermostat is fitted[for the motor]
Getting curiouser and curiouser lol. I think they need a shroud to be more efficient, but need to source problem first

Fan working should hold a full sheet of paper to the front of the radiator easily
I have a brand new shroud here for a single 21" fan if you need it[alloy]
what size radiator??mm x mm


Surely Davies Craig will have an answer ,they must have come across this over the years

[big_fletch]

Aaaahhhh, the plot thickens Dr Watson,

Curious as to why did you check the airflow with paper and your hand instead of just visually confirming the blade rotation?
I ask purely because airflows can be very deceptive around radiators etc.

Thinking about this again last night I was also wondering if cavitation may be an issue

At least being Davies Craig and only a few months or in the 3rd case, hours old, I'm sure they will make good on any faulty gear.

Nah I did check fan blade rotation as the blades need too be reversed too pull air not push ( Davis Craig fans are reversible). I just like too double and triple check myself haha

[the evil twin]

Nah I did check fan blade rotation as the blades need too be reversed too pull air not push ( Davis Craig fans are reversible). I just like too double and triple check myself haha

No worries, Cobber.

Not trying to tell anyone who has posted to suck eggs... this is for others reading the thread in future or DIY

If the fans are installed as pullers the installer also needs to swap the "polarity" of the motor leads not just reverse the blade assy and double check that the "must face forward" is correct as marked on the fan.

Davies Craig make very similar models that rotate clockwise and anti-clockwise and that is an easy trap to fall into as well (learnt that from experience insert forehead slap here)

http://www.daviescraig.com.au/Images/DCSL%20SERIES%20FAN%20INSTRUCTIONS%20(08-08-06).pdf

[AB]

No worries, Cobber.

Not trying to tell anyone who has posted to suck eggs... this is for others reading the thread in future or DIY

If the fans are installed as pullers the installer also needs to swap the "polarity" of the motor leads not just reverse the blade assy and double check that the "must face forward" is correct as marked on the fan.

Davies Craig make very similar models that rotate clockwise and anti-clockwise and that is an easy trap to fall into as well (learnt that from experience insert forehead slap here)

http://www.daviescraig.com.au/Images/DCSL%20SERIES%20FAN%20INSTRUCTIONS%20(08-08-06).pdf

Hey mate confirming polarity was swapped as well.

[NissanGQ4.2]

Are you sure its not overheating?

Does he only have the standard GU temp gauge or is he running an after market temp gauge?

[nissannewby]

How close is this particular part that is stripping to the core?

What else is in front of the radiator? Why did he do away with the viscous?

[AB]

Are you sure its not overheating?

Does he only have the standard GU temp gauge or is he running an after market temp gauge?

Standard gauge but its definitely overheating once fan/s stopped

[AB]

How close is this particular part that is stripping to the core?

What else is in front of the radiator? Why did he do away with the viscous?

The radiator place told him to put them on and they were working amazingly well prior.

He has 2 giant spotties in front of the radiator...I know I know, I told him that as well.

[threedogs]

doesnt explain why the aircon fan worked ?

[AB]

doesnt explain why the aircon fan worked ?

What do you mean mate?

[threedogs]

after the two melted you were able to continue without boiling[over heating] by turning on the Aircon.
think thats what you said earlier

Have you had a chance to call Davies Craig yet

[AB]

after the two melted you were able to continue without boiling[over heating] by turning on the Aircon.
think thats what you said earlier

Have you had a chance to call Davies Craig yet

We have spoken and they are coming to the party, great customer service but everyone just wants to know why.

[threedogs]

strange as it sounds I think they were working at HWY speeds some how,
creating a load that over heated them from being unable to keep up with the air coming in from the radiator.
Which explains why they worked fine at lower speeds up to 80kph they would be fine I think

[nissannewby]

If excess load was put on them to the point they have stripped then the current produced would cause some kind of ill effect either blowing a fuse or worse.

It would be interesting to see if the still stripped if they werent even connected and couldnt run at all.

What sort of conditions were present when this has happened?

[the evil twin]

Agree, there is no way you can load the fan enough to strip it if it is installed correctly and/or isn't a defective batch

It can't be no load issues either as the motors will spin them faster than they can freewheel.

There are gazillions of these things out there on vehicles that tow vans etc and go a sight faster than a 'Trol and no problems.

A truly curious problem...

[AB]

If excess load was put on them to the point they have stripped then the current produced would cause some kind of ill effect either blowing a fuse or worse.

It would be interesting to see if the still stripped if they werent even connected and couldnt run at all.

What sort of conditions were present when this has happened?

That would be a good test indeed.

Perfect condition for driving, can't remember exactly but let's say mid to high 20's and minimal wind.

[nissannewby]

Yeah but things like coolant temp, exhaust temp, oil pressure, trans temp if auto etc etc

[AB]

Yeah but things like coolant temp, exhaust temp, oil pressure, trans temp if auto etc etc

Only nissan gauges unfortunately mate and manual.

Coolant temp I believe was just sitting as normal 1/3 to half, egt no idea, oil pressure no idea but ill ask.

[nissannewby]

Ok. Im not sure what coolant temp sensor they use with the 6.5 but the nissan gauges sometimes dont actually start to move until around 100degrees.

[AB]

Only nissan gauges unfortunately mate and manual.

Coolant temp I believe was just sitting as normal 1/3 to half, egt no idea, oil pressure no idea but ill ask.

No oil pressure gauge...lol

Alarm didn't come on though.

[FNQGU]

Just for reference (sort of), my 6.5TD is on about 109 degrees when the Nissan gauge reads around 3/4 and yes, the Nissan gauge doesn't move until about 103 degrees or thereabouts. At 115 degrees the Nissan gauge is nearing the overheating mark. Those temp readings are from the thermocouple on the thermostat housing.

Also, my A/C generally adds up to 5 degrees celsius to my temps.

An interesting problem.

[AB]

I'll hopefully shed some light on this soon gents.

Must say that the customer service from them is outstanding!

[Winnie]

Hey Andy, did you ever work anything out with this?

[AB]

Hey Andy, did you ever work anything out with this?

I was waiting for someone to bump this..lol

New fans replaced and testing back at their factory is currently happening.

We haven't had a chance to put them in yet, it's winter time ;)

They will get back to us soon with their finds.

We are all stumped to be honest.

I will come back when I know.

I'm thinking a bad compound or an accidental mispack of 24 volt motors in 12v package but I'm only speculating of course.

What I can say is they took the problem serious and will find out what happened. I'm almost hoping it was our side but I just can't see it.

Really happy with their service though mate. Don't really see that kind of service much these days so kudos regardless of the crap mark went through.

[AB]

The difference it made to marks patrol was quite impressive too.

If these ones check out I could be very tempted to wang these in mine when money permits.

[Winnie]

They would compliment the sprinkler system quite well =]

[AB]

They would compliment the sprinkler system quite well =] that's funny...lol

[Winnie]

Lol, sounds like some pretty outstanding after sales service though... You're right, you really don't see that much now.

[mudski]

I was waiting for someone to bump this..lol

New fans replaced and testing back at their factory is currently happening.

We haven't had a chance to put them in yet, it's winter time ;)

They will get back to us soon with their finds.

We are all stumped to be honest.

I will come back when I know.

I'm thinking a bad compound or an accidental mispack of 24 volt motors in 12v package but I'm only speculating of course.

What I can say is they took the problem serious and will find out what happened. I'm almost hoping it was our side but I just can't see it.

Really happy with their service though mate. Don't really see that kind of service much these days so kudos regardless of the crap mark went through.

But didnt the same thing happen after fletch replaced them? If so i wouldnt think it's the fans.

[Winnie]

But didnt the same thing happen after fletch replaced them? If so i wouldnt think it's the fans.

What else could it be mudski? The installation is faultless. So it can't be the fans, and it can't be the install... Be very interesting when you guys finally work it out!

[nissannewby]

What else could it be mudski? The installation is faultless. So it can't be the fans, and it can't be the install... Be very interesting when you guys finally work it out!

Who knows but it certainly blows......

[AB]

Who knows but it certainly blows...... no it sucks ;)

[nissannewby]

no it sucks ;)

Im not a fan of your humour

[krbrooking]

Come on fellas cool it off now.

Sent from my iPhone using Forum Runner

[Cuppa]

All this intellectual humour has got me in a spin.

[Nightjar]

Will certainly be interesting to read what caused this problem.
Too much of a coincidence for all three fans to have same problem?
Surely the amount of checking has them installed correctly?
All indications point to incorrect installation/fan rotation, but the third installation was by a separate mechanic, both shops couldn't get it wrong?
Where was the power supply picked up from? Could it be an over voltage/amperage situation?
Just thinking out loud fellas, go easy.

[threedogs]

Will certainly be interesting to read what caused this problem.
Too much of a coincidence for all three fans to have same problem?
Surely the amount of checking has them installed correctly?
All indications point to incorrect installation/fan rotation, but the third installation was by a separate mechanic, both shops couldn't get it wrong?
Where was the power supply picked up from? Could it be an over voltage/amperage situation?
Just thinking out loud fellas, go easy.

Alternator giving too much power,,,, then not enough,,,, if the brushes are only touching on the edges of the comutator
it can cause problems. I think a constant supply of power may be a factor.
What alternators do you normally us with a 6.5,
Interesting problem though

[Winnie]

Alternator giving too much power,,,, then not enough,,,, if the brushes are only touching on the edges of the comutator
it can cause problems. I think a constant supply of power may be a factor.
What alternators do you normally us with a 6.5,
Interesting problem though

It was all tested though, no issue with power supply.

[AB]

Will certainly be interesting to read what caused this problem. Too much of a coincidence for all three fans to have same problem? Surely the amount of checking has them installed correctly? All indications point to incorrect installation/fan rotation, but the third installation was by a separate mechanic, both shops couldn't get it wrong? Where was the power supply picked up from? Could it be an over voltage/amperage situation? Just thinking out loud fellas, go easy.

Installation as per requirements and zero faults in both installers.

No over voltage or alternator regulator problems guatanteed.

No probs mate, it's all done 100%

[AB]

Alternator giving too much power,,,, then not enough,,,, if the brushes are only touching on the edges of the comutator it can cause problems. I think a constant supply of power may be a factor. What alternators do you normally us with a 6.5, Interesting problem though

100% regulator producing correct power :)

[mudski]

What else could it be mudski? The installation is faultless. So it can't be the fans, and it can't be the install... Be very interesting when you guys finally work it out!

Dunno. Im just not convinced its the fans at fault here. Only because a new one was installed and failed too.

[threedogs]

under tests it may show 100% but a loose earth strap faulty relay or such might make it play up under working conditions.
After all its a mix and match 4x4, Im doing some shops early next week I'll ask if any have heard of this happening before.
Dying to know what it is, 5 cents or $500 fix

[nissannewby]

If they are fused (which they should be) then these would be blowing left right and centre with the amount of amps required to melt these things. Even your standard relay would most likely be cactus due to the current draw.

[AB]

If they are fused (which they should be) then these would be blowing left right and centre with the amount of amps required to melt these things. Even your standard relay would most likely be cactus due to the current draw. yep both are fused and never blew nor any signs of excessive heat/melting.

[NissanGQ4.2]

Can we have pics of the fans Andy????

[AB]

Can we have pics of the fans Andy???? I don't have any pics on my phone unfortunately mate.

[NissanGQ4.2]

I don't have any pics on my phone unfortunately mate.

I know what your going 2 be doing 2morrow then!

No one took any pics? whats this world coming 2!

[Nightjar]

Any developments with this mystery?

[AB]

Any developments with this mystery? haven't heard back yet mate.

[Nightjar]

Waiting waiting!

[AB]

Waiting waiting! as am I mate....

[Winnie]

as am I mate....
Are Davis Craig still helping to find the issue?

[AB]

Are Davis Craig still helping to find the issue? I assume they are mate, I'll have to ask mark.

The new ones are working fine but we out of summer now and can't really test it in the conditions where they failed last time. I.e towing in 30 degrees for hours, etc.

[NissanGQ4.2]

The new ones are working fine but we out of summer now and can't really test it in the conditions where they failed last time. I.e towing in 30 degrees for hours, etc.

Over heating issue, nothing to do with the fans itself is my mechanical answer *LMAO*

[AB]

Over heating issue, nothing to do with the fans itself is my mechanical answer *LMAO* overheating of the motors on the fans or the vehicle engine?

It is not the vehicle engine overheating that's for sure because it was running cool as a cucumber prior to fail.

[NissanGQ4.2]

overheating of the motors on the fans or the vehicle engine?

It is not the vehicle engine overheating that's for sure because it was running cool as a cucumber prior to fail.

Vehicle engine / radiator

If the motors on the fans were working with no issue when he first got them and only burnt out on a hot day I would lean towards them not being the issue to start with.

And your cool as a cucumber was only on a needle gauge which means nothing....

But as I said I'm no mechanic......will be interesting to find out there results

[AB]

Vehicle engine / radiator If the motors on the fans were working with no issue when he first got them and only burnt out on a hot day I would lean towards them not being the issue to start with. And your cool as a cucumber was only on a needle gauge which means nothing.... But as I said I'm no mechanic......will be interesting to find out there results

It has nothing to do with the electronic motors on the fans? They are fine mate...

It's the plastic fan itself which has let go from the motor spigot nut moulded into the fan core.

[NissanGQ4.2]

Any updates on this Andy???

[Winnie]

You would not believe it I was looking for this thread today to ask the same thing but I could not find it!
Did you read my mind, Todd?

[AB]

No news, never heard back gents???

[AB]

No news, never heard back gents???

Current fans are working fine but time will tell in summer time I guess.

[NissanGQ4.2]

You would not believe it I was looking for this thread today to ask the same thing but I could not find it!
Did you read my mind, Todd?

Yes I did poo bear, I'm a very talented man sometimes *L*


No news, never heard back gents???

That s!cks, would of been interesting to hear what they believed was the cause, maybe it was a faulty batch of fans and they never wanted 2 admit 2 it

[NissanGQ4.2]

So I'm guessing as this thread hasn't been updated the new thermo fans are working a treat in this hot weather

[AB]

So I'm guessing as this thread hasn't been updated the new thermo fans are working a treat in this hot weather work has been hectic to be honest mate but they are working fine with short distance.

Need to find time to haul a camper on a long trip in reasonable heat.

Might be a good excuse to head up the Murray soon me thinks ;)

[Sir Roofy]

work has been hectic to be honest mate but they are working fine with short distance.

Need to find time to haul a camper on a long trip in reasonable heat.

Might be a good excuse to head up the Murray soon me thinks ;)

Come and join the oldies for some memorable times family fun and stories

[AB]

Come and join the oldies for some memorable times family fun and stories where are you blokes going again?

[Sir Roofy]

where are you blokes going again?

At the moment any where waiting on Bob to get back to me

[AB]

At the moment any where waiting on Bob to get back to me Strathmerton.

I'll show a good spot and if anyone has a tinny to cross the river I guarantee cod ;)

[NissanGQ4.2]

Any update on this AB?

[threedogs]

Ive asked as well a while back maybe now MB is
a member we can get an idea on the cause

[MB]

G'day Folks,
Wow, I just found out this specific thread existed, all 7 pages:-)
Thanks heaps for all your assistance to AB whilst I was a non member and having troubles roadside. I guess an update from MB is in order here, haha!
Unfortunately I'm still as stumped as we all are but can say this. Davies Craig were truly amazing, hand delivered 3 fans all the way out to Yarra Glen and took the others back to their base for their own investigations.
The ones in the car now were dated 4 weeks manufacture prior to their delivery.
The 3 ones prior were all dated quite closely around 1.5 to 2 years ago now.
Upon their awesome efforts in coming out to dropoff/collect I did query possibilities of a batch of 24v incorrectly labelled 12v but was assured not possible.
Not sure what else I can say but she's been running great and do honestly appreciate their and all your efforts especially Fletch, Cheers :-)

PS: There is a little method to my madness having removed the stock fan and mounting twin thermos side by side with a gap between. Leaves just enough room for the Harrop charger belt heading down below for when I win Tatts:-)

[AGman]

You have 2 fans hooked up in parallel? When they spin they generated a voltage/current and they are feeding back into each other, put an individual relay on each motor so when they aren't on they are isolated from each other.

[MB]

Thanks AGman, yep each fan runs back to its own 180amp relay and is now just recentally installed thermo controller by this ripper company from the USAhttp://www.nissanpatrol.com.au/forums/images/imported/2016/04/178.jpg



Sent from my iPhone using Tapatalk

[MB]

Better pic below:
http://www.nissanpatrol.com.au/forums/images/imported/2016/04/179.jpg



Sent from my iPhone using Tapatalk

[NissanGQ4.2]

Thanks for the update MB, shame Davies Craig never got back 2 you with what they believed 2 be the issue. Good 2 hear the new fans are working great