Question about 2002 Chevrolet Impala

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2002 chevy impala 3.4

My 2002 impala cooling fan's will not come on automaticaly, i have check the motor's they work, i have changed the temp sender, the relay's, thermostat, there is no leak's, please help i have worked on a lot of car's but this has me mr mo. i have the same problem i am going to get a radiator flush this is all i can think of.

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  • Michael Beverlin May 11, 2010

    Have you thought about looking into the ECU or the BCM?? I doubt its the BSM, but you might have an issue with the ECU.



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No the flush will not help. Will the fans come on when you turn the ac on.. You should have a fan relay under the hood.. Have you hooked up a scanner to the computer.. If it never gets hot enough it wont turn on. The fan is computer controlled by a modulated ground. If you dont get a ground signal at the motor when at 230 degrees you may have a defective PCM.

Posted on Aug 01, 2009

  • wirenutdave Jun 06, 2011

    6-5-2011 I have a similar problem with my 2002 3.4, AC wont come on. Engine cooling fans wont come on via system on but have checked out ok. tested PCM to the cooling temp sender, got the 5.1 volts. Changed the temp sensor but didn't solve the problem. Is the ECM the problem? Does it have the AC locked out?


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I had this problem on my chrysler and came to find out I had a wire burned out in the hornance so instead of replacing the hornance I jumped a wire behind the burned part. Sounds like its a wiring problem.

Posted on Aug 01, 2009


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