Question about 1999 Pontiac Grand Prix
It is your sensor or the.heater core
Posted on Jan 26, 2012
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.
Posted on Nov 22, 2010
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Posted on Jan 02, 2017
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