1999 Pontiac Grand Prix Logo
Posted on Nov 04, 2010
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The heat in my 99 Grand Prix GTP only works on the passenger side of the car. The blower works fine but only blows cold air on the driver side. Is this the heater core or possibly a fuse. Any suggestion would help. Thanks

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  • Posted on Jan 26, 2012
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It is your sensor or the.heater core

Anonymous

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  • Posted on Nov 22, 2010
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I'm having the same problem with a 2000 GTP. I think the problem is a stuck or malfunctioning heater actuator door (LH). I don't have a error code on the HVAC display (flashing man) so I think its a mechanical failure rather than a sensor / voltage issue. I plan to fix within the next week. I'll post a follow-up response.

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My heat and front defrost on the driver side of my 2002 Grand Prix is blowing cold air. My passenger side works fine though. What would I need to fix this?

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