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Cooling fans not working

Tiny
JPALKENS
  • MEMBER
  • 1997 CHEVROLET LUMINA
The engine cooling fans do not operate at elevated coolant temperature levels. To run the fans I have to switch the climate control to A/C to bring the temperature down. If I disconnect the coolant temperature sensor on the engine block the fans will run regardless of the coolant temperature. Is this an ECM problem, if so how can I cure it?The fans don't run even when the temperature gauge is in the 'red' zone.
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Thursday, November 4th, 2010 AT 9:51 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

What happens is the temperature sensor goes bad due to heat and engine vibration and needs to be replaced.

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Here is a guide that will show you what you are in for when doing the job with a diagram (below) of what is like on your car.

Please let us know what happens.

Cheers, Ken
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Tuesday, April 6th, 2021 AT 7:53 PM

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