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On some of the older GM cars had a problem with dieseling (run on) so rather then telling their customer to shut their car of with it in drive. They put a interval timer relay on the ac compressor that activates when the car is shut off. This adds drag to the motor so it won't diesel. It should release within 30 seconds or so, or it will kill your battery quick (3-4 hours).

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16y ago

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