Question about 2004 Pontiac Grand Prix

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Heater dont work ,when i switch it on nothing is going on.sometimes when i hit yhe side panel of dash it works,that was before ,but not anymore .i think sometimes now i hit it only on low as before i had full control.

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Blower control modular,,

Posted on Feb 01, 2010

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Bad head gasket

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Electrical problem


This is going to be a loose ground. Since the problem occured after a heater core replacement I would check the ones there. Pull the kick panels off of both sides and make sure the grounds are hooked up and tight. They will have bolt thru connectors on the end of the wires.Also look at the center brace area under the dash sometimes they have them there too.

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you are correct - its called a heater control module,mounted on heater case under dash - i believe it is only available at dealers,but i could be wrong

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