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

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Originally Posted by 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

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100% on correct way.

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

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.

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

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

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!!!

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Originally Posted by the evil twin

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

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Parallel mate...

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

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Originally Posted by 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!!!

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

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

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Originally Posted by the evil twin

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

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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 :)