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Old 03-01-2007, 07:26 PM
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xntrik xntrik is offline
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A thermostatic fan clutch drives when the air temperature through the radiator exceeds the thermostat setting of the clutch.

220* coolant temp is too high.

Where did you read 70% ?
A fan clutch will totally lock up when engaged.
It disengages by temperature and high rpm.

I have gotten the best service from Imperial brand.

I also don't like HD rated clutches, as they don't disengage by rpm until a higher range, and become audible in the vehicle at 40-50 mph when you shouldn't need a fan anyway above 30.

I made a mistake once and installed a HD one on my "TownCar" (high gear w/OD) and at 100+ ambient it hummed until 78 mph. Took it back and got a standard duty.
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