Question about 1999 Pontiac Grand Prix

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Air conditioning I have cold air comming from passenger side only and driver side iar vents only blow hot/warm air.

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  • fbmiller Jul 17, 2008

    I have the same problem with warm air out the driver side cold out the passenger.

  • Anonymous Jul 27, 2008

    I have cold air on driver side and warm air on passenger. We removed the panel under dash and both sides are cool now. The water from air conditioner goes on the passenger floor instead of outside. It is alot of water.





  • jen8 Jul 31, 2008

    I have the same issue with warm air coming out the driver side on my 2000 GP. We recharged the system about a year and a half ago, but that has not fixed the issue on the driver side. Our repair place tried messing with the controls that move air over to the driver side, but to no avail. Only way I can get any cold air to come out is close the center vent completely, and it takes up to 20 min to cool off on driver side from hot air when the temps are above 100 (we live in Phoenix.)

  • dcochran Apr 28, 2009

    Where are the mode doors which control the air flow?

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On a w body car with a single temp adjustment control (not a dual zone) your problem should be a low refrigerant charge. Due to the design of this evaporator, a low refrigerant charge will cause the furthest areas from the inlet and outlet hoses (the drivers side) to not remove the heat from the incoming air. This allows the air on the drivers side to be outside temp but refrigerated on the passenger side. In cars with Dual Zone controls you must not only verify the refrigerant charge level, but also check the mode doors which control the air flow and regulate the temp. To check the refrigerant level do not use pressure gauges alone. Verify a proper charge level by checking the temperature of the two aluminum lines going in to the firewall of the vehicle. With the A/C set to high the temperatures should be within 5 degrees of each other. If not, then there is a charge issue. I hope this helps

Posted on Jul 30, 2008

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