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Fan clutch testing
Hey I am changing radiator, and CAC. Figured I would test the radiator fan clutch while everything is easy to get at. So I did some testing with engine off and key on. When I pull in the high speed coil it locks up solid. All good. When I pull in the low speed coil it pulls in and has some drag but not much. With it in low speed belts tight I can still spin the fan. To the point if I wasn’t testing it I could not tell the difference between low and off.
My question is this. How much friction is normal in low speed.
Thanks
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1 Reply
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Not much friction is normal for low speed and solid is normal for high speed.
Test to do at the 3 prong(A, B, & C) fan clutch connector:
A is for low speed, gets 24+volts on the bus side of the conector, and 30-36 ohms between A to C on the fan side of the connector;
B is for high speed, gets 24+ volts on the bus side of the connector, and 14-17 ohms between B to C on the fan side of the connector;
C is ground
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