How to Check the Coolant Temp Sensor ? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 1 (permalink) Old 10-24-2015, 07:17 PM Thread Starter
chip1990's Avatar
Join Date: Jan 2015
Location: Columbus, Ohio.
Posts: 46
How to Check the Coolant Temp Sensor ?

Me again with my Alero GL 2001 GM3400 SFI V6.

I saw that the temp gauge was going higher than usual ( pass half way mark and up ) so I stopped and checked the engine bay - The radiator fans were not moving. If AC is on the fans are starting and the coolant temperature goes and stays at normal levels - strange thing, even if I turn off the AC the fans are keep going...

I narrow it down to the coolant sensor that I replaced not to long ago when I did the LIM gasket. If I disconnect the cable from the sensor fans are going at full blast but I loose the temp gauge...

Is there a way to test the sensor , maybe with a multimeter for resistance ? I don't want to replace it if it's not at fault - not to long ago I replaced this sensor and I managed to crack the LIM.

Are there any ground points, or connections that I should look into? So far I cleaned the connection between sensor and connector and three grounds that are around air filter box ( the only ones that I could see ) . and checked the harness for visible damage but no luck. Should I maybe go by the PCM connector and clean / inspect?

Thanks for looking into this!

Last edited by chip1990; 10-24-2015 at 07:26 PM.
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