1995 3800-sc Cooling fans not working - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-16-2012, 01:23 PM   #1
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Default 1995 3800-sc Cooling fans not working

I know a 1995 Bonneville with a Supercharger normally runs hot but I am at the point were I am afraid to get stuck in any traffic as the temperature rises as soon as I slow down.
I checked my fans with the motor running very hot and neither one was running.
Is there a fuse somewhere for these are a whey to check the fans. I dought they would both go bad at the same time.
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Old 03-16-2012, 01:58 PM   #2
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the fuse id probably pass side underhood fuse block. try turning on the a/c i think one or both are supposed to come on with the a/c. could be a relay too.
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Old 03-16-2012, 03:25 PM   #3
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On your 95, the low speed fans will kick on at 212 degrees. The high speed fans will kick on at 226 degrees.

To test if the PCM will turn them on...
Have engine running.
Disconnect the Engine Coolant Temperature electrical connector. When the PCM sees an OPEN connection to the ECT sensor, it will go into SAFE mode and automatically turn the fans on.

This is the sensor that sits right below the upper radiator hose on the engine. Or right above the exhaust crossover pipe.
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Old 03-16-2012, 03:26 PM   #4
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Also, this will cause your Check Engine Light to come on. But this will clear itself out once you reconnect it and complete a couple start/drive cycles. Or you can clear it by disconnecting the battery for a few mins.
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