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Re: Fan Clutch (archive)

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Posted by Gilbert on April 07, 2001 at 22:43:39:

In Reply to: Fan Clutch posted by Jyrki on April 07, 2001 at 12:53:45:

Jyrki,
I was having problems with overheating while in slow traffic. I was told that if you could stop your fan with a roll of paper towels while idling, then it was bad. I bought a new fan clutch only to find it is just as easy to stop as the old one. I then kept diagnosing and found that the sending unit - the thermostatic switch on the right side of the radiator that turns on the electric fan - was bad. I replaced it for about $10. So your fan may not be bad.
I noted that the fan clutch seems to engage when the engine is first cranked, as you can hear it blowing when you rev the engine with the hood open. It then seems to start coasting after just a few seconds. As my engine got really hot several times when I was trying to diagnose it, I can tell you it must get really really hot before the clutch engages. If you have the hood up the heat dissipates and the clutch doesn't get hot enough to engage. If I closed the hood for a few minutes with the engine running hot the clutch would engage. I could tell the change in the sound and could feel the extra air coming out from under the car. Open the hood, the heat dissipates and the fan clutch would disengage and seem to coast again, even though the engine was still near the red zone.
Anyway, if you are going to get one I'd suggest you just buy a new one, but I'd also check out the operation of the electric fan before you do, assuming you have one. You're welcome to my old one if you want it. Just pay the freight from Tampa. But if you don't buy a new one I suspect you will always wonder... Just let me know.
Good luck.
Lin Gilbert
1990 750iL


Do anyone have a fan clutch for sale?
Large 32mm nut.

735il -88

Jyrki





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