My heater fan stays on after car is shut off, and this is killing my battery. What can be done about this?
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2005 Chevrolet Malibu Maxx
Question: Heater fan
Answer #1dandd December 20, 2009, 14:32Master
You need to have the data stream of your Body Control Module Scanned. There is something, obviously, that is not shutting off. I usually use the BCM data stream to find this. The BCM should be aware of what the fan control is doing. I don NOT mean a Parts Store teeny weeny scan which is sometimes a SCAM!. Have a pro tech do this with a good quality OEM capable scanner. They should be able to see if a relay is sticking, the Ignition switch is defective, or the BCM is incorrectly appyling power to something after is has been shut down. I have seen this problem a lot with Corvettes.