Replaced Temperature sensor and thermostat, fan constantly runs.

1992 CHEVROLET
18,000 MILES
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TPALMER
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My 1992 Chevy K1500 PU appears to be overcooling, I have noticed that the clutch fan is constantly engaged. How do I check to ensure that the clutch fan is functioning properly?
Jan 8, 2012 at 12:32 AM
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RIVERMIKERAT
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Do you see any fluid leakage on the fan clutch? Does the fan clutch wobble by hand? IS yes to either, replace the clutch.
Jan 8, 2012 at 1:05 AM
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TPALMER
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No wobble, no fluid leakage, truck sat for approx. 60 days while I was out of town working. Could clutch fan be stuck or ceased engaged?
Jan 9, 2012 at 7:23 PM
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RIVERMIKERAT
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Try turning the fan by hand, WITH THE ENGINE OFF. If you can't do it without turning the pulley, the clutch needs replacement.
Jan 9, 2012 at 8:55 PM
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TPALMER
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I can turn the fan when the engine is off. If I hold the clutch part at the front of the fan blade stationary, should I still be able to free spin the fan, with the engine not running?
Jan 10, 2012 at 2:49 AM
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RIVERMIKERAT
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Not free spin, but there should be slight resistance with the engine cold and more resistance with the engine hot.
Jan 10, 2012 at 3:08 AM
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TPALMER
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And if no resistance, what do I need to do?
Jan 10, 2012 at 4:46 AM
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RIVERMIKERAT
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  • ASE Certified Mechanic
Replace the clutch. But if the fan spins too freely when cold, it won;t explain the 'over-cooling' situation. In fact, just the opposite.
Jan 10, 2012 at 5:14 AM
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