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Clutch Fans, someone refresh my memory

Started by TruckDriver, August 28, 2005, 11:23:17 AM

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TruckDriver

August 28, 2005, 11:23:17 AM
I'm having a brain fart here. :-[

What's the difference between a non-thermostatic fan clutch and a thermostatic fan clutch?
PETE

My Dad taught me about TIME TRAVEL.
"If you don't straighten up, I'm going to knock you into the middle of next week!" :P

Ghoste

#1
August 28, 2005, 12:03:27 PM
Non-thermo has a silicone fluid in it that allows the fan to slip at higher rpm when it's needed less.  There is no specific point where it slips, it's just a function of the amount of force to make the silicone shear.
Thermo has a bimetallic spring on the front that tries to make sure the silicone clutch is engaged at hotter temps.  I forget the exact mechanics of how it does this but that is the basic method of the two.
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