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Its the connecter that you unplug from the temp sensor. That connection is usually bad and can be fixed by directly putting the wires together or cleaning each connector. Had the same problem on 1998 grand prix gt 3800 series 2


The problem might be with the body control module (BCM). The PCM sends the signal to the BCM, which turns the fans on. Or you can buy a separate temperature fan relay system with a temp probe and bypass the system. It will work as normal cooling when needed only.

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