Threedogs motor thread

[mudski]

Me too......


Mark, when you span the viscous hub it had no belt or plastic fan on correct. Spinning it like that it's on the bearing. With everything back on and stone cold it moved one blade.

A/c fan is only meant to go on with air con regardless of temp or when temp is high 90 or 100 degree.

Correct John. I spun the hub with no fan on it. I did it to check if it was lose. There is a procedure to check if the hub is engaging or not but I can't remember tbh how it goes. I'd have to look it up.

[jay see]

I only know of the spin test, but it must be cold if spinning when hot you can see that is spins alot more freely.

[Bob]

Correct John. I spun the hub with no fan on it. I did it to check if it was lose. There is a procedure to check if the hub is engaging or not but I can't remember tbh how it goes. I'd have to look it up.

The following taken off another site


Re: How do I test a viscous fan hub?

Without taking it off the vehicle, the fan hub should be locked up for about 30 secs to a minute on start-up from cold, then it should let the fan free-wheel until the temp rises above normal; so if you start it from cold and watch/listen for that 30-60 secs of engaged fan before it slackens off, then leave it sit there on a fast idle for a while with the heater on high (A/C off), maybe even put a piece of cardboard in front of the grille/radiator to limit air flow & encourage it to reach operating temp & then go over, the fan should cut in again and you should be able to see/feel/hear it when it cuts in again. Let it do it's cool down thing & then shut the engine down, the fan should stop pretty much straight away if the temp is at or above normal, if it spins on for more than one rotation on shutdown or you haven't been able to see/feel/hear the airflow increase as above, the viscous fan hub isn't doing it's thing properly.

[the evil twin]

I don't know how many times Yendor or I have to post this but anyway...

Under normal loads and conditions the A/C fan has bugger all to do for overheating.
You can take it off and hoik it down a long drop if you want.
Later model 'trols don't even have them.

Where fitted the A/C fan should run under two conditions;
Either the A/C is selected
OR
The coolant is above 100 degrees C

When the A/C fan starts running with the A/C OFF it means the engine is already starting to overheat because the coolant sensor has detected that it is at 100 degrees AFTER it has passed thru the radiator.
Ergo, unless it is a stinker of a day or you are loaded up then something is wrong

[Clunk]

I don't know how many times Yendor or I have to post this but anyway...

Under normal loads and conditions the A/C fan has bugger all to do for overheating.
You can take it off and hoik it down a long drop if you want.
Later model 'trols don't even have them.

Where fitted the A/C fan should run under two conditions;
Either the A/C is selected
OR
The coolant is above 100 degrees C

When the A/C fan starts running with the A/C OFF it means the engine is already starting to overheat because the coolant sensor has detected that it is at 100 degrees AFTER it has passed thru the radiator.
Ergo, unless it is a stinker of a day or you are loaded up then something is wrong

Probably a few times more

[mudski]

I don't know how many times Yendor or I have to post this but anyway...

Under normal loads and conditions the A/C fan has bugger all to do for overheating.
You can take it off and hoik it down a long drop if you want.
Later model 'trols don't even have them.

Where fitted the A/C fan should run under two conditions;
Either the A/C is selected
OR
The coolant is above 100 degrees C

When the A/C fan starts running with the A/C OFF it means the engine is already starting to overheat because the coolant sensor has detected that it is at 100 degrees AFTER it has passed thru the radiator.
Ergo, unless it is a stinker of a day or you are loaded up then something is wrong

My coolant temp has been over 100c many times and the fan never comes on. Now whether my particular model is designed not to do this or not. I dont know. I might go for a drive tomorrow up the hills behind me and give it a flogging and get the water temp over 100c, which wont be hard, stop and double check on this.

Sent from my SM-P600 using Tapatalk

[jay see]

My coolant temp has been over 100c many times and the fan never comes on. Now whether my particular model is designed not to do this or not. I dont know. I might go for a drive tomorrow up the hills behind me and give it a flogging and get the water temp over 100c, which wont be hard, stop and double check on this.

Sent from my SM-P600 using Tapatalk

Before you go put on the air con as if it's a 40 degree day and have a look at the fan, can't remember if you said that it works only with the air con on or never.

[the evil twin]

My coolant temp has been over 100c many times and the fan never comes on. Now whether my particular model is designed not to do this or not. I dont know. I might go for a drive tomorrow up the hills behind me and give it a flogging and get the water temp over 100c, which wont be hard, stop and double check on this.

Sent from my SM-P600 using Tapatalk

I'm sure it has... certainly mine did many times in the WA summers

The 'coolant temp' temp isn't measured in the same place or by the same sensor as the Coolant Temp 100 degree switch (if fitted)

[threedogs]

I think I just "burped" a bubble out of it ,{air pocket}

[Clunk]

So what's new?