Question about 2005 Pontiac Grand Prix

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No heat! A/C works 2005 Pontiac GP

No heat! A/C works and will blow out colder air when turned down just won't produce any heat.

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You could have a problem with whats called a mixing door, it's not changing position from AC to the heater position. They are moved by electric motors or vacuum diaframs. Most new cars are electronic. Does the defroster work ?

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital...


I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

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There is a flap in the venting itself that can get stuck. Or the actuator that moves it can become faulty. It is located above heater core and it's housing. You will have to remove bottom console to access it.

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1998 grand prix no heat on 1 side


thats most likely what it is. either that, or something has fallen down the defrosters and its blocking the blend door from opening or closing

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I don't want to over step my knowledge but you car is only 3 or 4 years old. I don't think your heater core is bad, unless it is leaking, Sounds like you have a blend door problem in the HVAC system. This door is actuated by a servo motor switching from hot side to cold side. This little servo can go bad and need replacing. Just make sure you don't have any bubbles in the coolant system first as long as you havent done any thing with the coolant system you souldn't have any air in the system Hope this helps you. Please rate my solution for you thank you

Jan 18, 2009 | 2005 Pontiac Grand Prix

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