Radiator and A/C fans.

  • 1 POST
  • GMC

Hi I have a 1995 3.1 Chevy Lumina, I went out to my garage and noticed that my fan was running and had been on all nite. It is the fan on the drivers side. I had to pull the fuse in the front under the hood. What would cause the fan to run all the time? Could it be a senser? And would the senser be on the the radiator passinger side? Thanks for all you help. Joe [/b][/i]

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Saturday, April 15th, 2006 AT 8:13 PM

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  • 1,626 POSTS

Right fan is for the condenser. The left fan is the coolant fan. It could be a fan relay but I suspect the coolant sensor as the fans are turned on by the ECM predicated by the engine temp which is provided by the temp sensor. Was the fan on Low or high speed?

There are two or three fan relays. And all the same. Change them around and see if the symptom moves with the relay if not do as suggested below.

The sensor is located directly under the air intake to the throttle body. It has two wires one is yellow and the other color varies. Make sure the engine is cold and the radiator cap off. You will loose a little coolant and have a skinned knuckle or so as the space is tight.

It is cheaper to replace than an ECM as that may be the trouble but the last resort as the ECM's are pretty much bullet proof. The fans are controled by the onboard prom depending if the vehicle has A/C or not. If the sensor doesn't fix the problem it could be the prom.

Some 95's have replacable proms and some don't. If you computer is in the engine compartment then it can't be replaced but it can be reprogramed by a dealer. If the ECM is inside the car then the prom can be replaced and is a dealer item. Good luck Let me know

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Saturday, April 15th, 2006 AT 8:33 PM

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