Eratic Heater/AC Fan 2003 Bonneville - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 09-06-2009, 07:22 PM   #1
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Default Eratic Heater/AC Fan 2003 Bonneville

Does anyone have experience troubleshooting erratic heater/AC blower fan operation on a 2003 SE? It works when it wants, sometimes several minutes after being selected, sometimes not at all. It is a problem with all functions (AC, heat and defrost). I suspected a loose connection, but haven't found one. I was told it could be a ground issue or the HVAC control module but don't know where it is located or how to check it. Any help would be appreciated.
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