Re: How and when does my engine cooling fan clutch work?

Posted by Glenn(WV) on January 25, 2002 at 11:20:08 from (208.157.5.14):

In Reply to: How and when does my engine cooling fan clutch work? posted by Alberta Mike on January 25, 2002 at 10:55:48:

I had a thermostatic fan in my old T-bird. I had to replace the clutch. Here's what I learned about it:

The "clutch" is filled with a viscous fluid. There was a small wire curled up on the front of the clutch(like that in a household thermostat). When the engine is cold, the fluid is thick and serves to couple the fan to the driving pulley, thereby driving the fan. As things come to temperature, the fluid warms up. When the fluid warms up, it gets thinner. The coupling effect between the fan and the hub is reduced, which causes the fan to rotate slower. A slower-speed on the fan improves fuel mileage. It does rotate slower when the engine is warm, but it never totally stops.

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