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Old 05-10-2008, 07:09 PM   #1 (permalink)
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How to check cooling fan clutch?

Im just wondering if my cooling fan is working properly. Ive got a 1988 22r and ive never seen the motor run without the fan spinning even in cold weather. I thought the fan wasn't supposed to turn until the motor heats up. Also is the fan supposed to quit spinning when you reach highway speeds? And is there a way I can test my clutch? Thanks
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Old 05-10-2008, 07:29 PM   #2 (permalink)
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The fan is supposed to spin continuously, but at relatively low RPM except in when extra radiator cooling is needed. Conditions when the fan should roar loudly include creeping along in bumper to bumper traffic and going up hills in hot weather. In really hot weather (around 100 degrees F) the fan may roar more or less continuously.

To check the fan clutch, open the hood in the morning before starting up the engine. The fan should spin with considerable resistance. If the fan free wheels with no resistance then the fan clutch is bad. But they rarely go bad. A symptom of a bad fan clutch is the engine temperature gauge rising up to the 3/4 mark or beyond in bumper to bumper traffic and going up hills in hot weather.
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Old 05-11-2008, 10:57 AM   #3 (permalink)
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What verlaryder said, mostly. It shouldn't take a great deal of effort to turn the fan when the engine (and everything around it) is not warmed up. But, it should take effort. If it spins easily, or if it's impossible to spin, then the fan clutch needs to be replaced.

It's not uncommon for an old fan clutch to fail, either, but they usually do so by seizing up. I had to replace the fan cluch on my '88 4Runner for exactly that reason. Just driving slowly around a parking lot created a deafening roar from the fan, because it was running at crankshaft speed (seized fan clutch, no slipping at all).
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