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Look for excessive play in the bearing on the clutch shaft and for evidence of the silicon fluid leaking out. inspect the front of the clutch assembly with a light if you see a greasy substance around the thermostatic spring it is going bad. Run the motor at 2500 rpm or so and quickly shut it off while someone watches the fan and if the fan spins more than 4 or 5 seconds the fan clutch is bad. The Fan Clutch does not have to be engaged for this spinning test. And for a little tidbit from a Delco manual:
A used fan clutch which is taken off for repair of other engine components must be stored in its normal running vertical position until it is reinstalled or it will not work properly again.

Greg B
 
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I just learned that little tidbit about storage of a used fan clutch.
I had always stored them face down I guess all of mine are trash now.

Greg B
 
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