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To replace the HVAC control module on a 2001 Buick Regal, first disconnect the negative battery cable to ensure safety. Remove the trim panel surrounding the HVAC controls, then unscrew and disconnect the old control module from its wiring harness. Install the new module by connecting the wiring harness and securing it with screws, then reattach the trim panel and reconnect the battery. Test the new module to ensure proper function.
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