Question about 1999 Pontiac Grand Prix

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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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It is your sensor or the.heater core

Posted on Jan 26, 2012

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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.

Posted on Nov 22, 2010

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1 Answer

Heat not working on the drivers side


The heater core may be plugged up so that no coolant flows, thus no heat at all.

Jan 27, 2014 | 1999 Pontiac Grand Prix

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1999 pontiac grand prix gtp dual airconditioning problem, driver side air condition is blowing hot passenger side blowing cold


Two things can be the problem,first,try adding ,a little freon,if it is low,it will only cool one side,then if this does not help,there is a door actuator motor that controls this,it could be not working,the dash has to come out to replace this actuator motor,if this was at all helpful,please rate,thank you.

Jul 13, 2010 | 1999 Pontiac Grand Prix

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99 Grand Prix blows hot air on drivers side and cold air on passenger side??


sounds like heater box diverter stuck close is it manul switched or when your turn switch you hear a wistle **** sound could be a purdger gone//// good place to start looking

Dec 23, 2009 | 1999 Pontiac Grand Prix

2 Answers

Only the passenger side vents blow cold


The cabin filter might be clogged, try replacing it.

Sep 30, 2009 | 1999 Pontiac Grand Prix

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No heat. Blower works fine. Noticed that the temperature control knob is not illuminated. All other knobs are illuminated. The outside/recirc air actuator is working properly.


If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox

Tech JK
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Sep 19, 2009 | 2006 Pontiac Torrent

1 Answer

A/C issue with 99 Grand Prix


Check the ac filter, it might be dirty and thats why it is not blowing out enought cold air. The filter is located under the wiper cover but behind the firewall on the passengers side. You access this by lifting the hood and removing the rubber type gasket that holds both together, right on top of the blower unit.

Apr 24, 2009 | 1999 Pontiac Grand Prix

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