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Old 04-05-2011, 03:26 PM
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babymog babymog is offline
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,765
TF007 is correct. When you first start cold, the fan will be engaged and roar when you rev the engine until the fluid is distributed and the fan disengages.

It should not be engaged and roar with engine revs after that, with the hood up you should not get a lot of wind and noise from the fan when revving.

Once the coolant is up around 195F (check the FSM for the exact number) the fan should again engage, which will turn it up to around 3000rpm and then the clutch will partially disengage to limit max. fan RPM.

The fan should turn with some resistance when the engine is shut off, hot or cold. Without the engine running the clutch can't operate, the hub needs to be spinning. If it spins freely it has probably lost its fluid. If locked up, it's probably seized. If it has ANY perceivable play, find where the play is (loose bolt, bad bearing, etc.) and replace the offending part(s) before you lose a radiator and fan. Clutches are expensive, but when you add the fan, radiator, belt, shroud, and anything else that could be damaged the clutch will seem cheap.

Also, as mentioned, the clutch is a speed-limiting device for the fan. If it is somehow locked up you run the risk of the fan coming apart at high RPMs like a BMW fan, which can also get expensive.
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