Question about Cars & Trucks
Check out the 2 hoses that go to the firewall from the engine block. One of them has a mechanical valve that needs to open and close when you turn on the heat and turn up the thermostat inside the car. Have someone turn on the heat controls and move the thermostat back and forth from cold to hot while you look under the hood at the valve. If it isn't moving check its control cable to see if it is attached tightly to the arm of the valve.
Posted on Jan 09, 2013
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Posted on Jan 02, 2017
SOURCE: 99 park avenue blows cold
As snowbird said, it's most likely your passenger climate control system. Could be a short in a wire or a burnt acuator that moves the passenger door open and close. If you don't have the money or time to troubleshoot the problem you can pull down the glovebox and you'll see a metal rod about 8 inches long connected to the acuator. If you pop it off by the white connector, you can move it to full hot or cold. If it was the heater core it wouldn't matter where the air is comming out, it'd be the same temp.
It'll take you 5 minutes tops to simply check it by moving that door.
Posted on Oct 30, 2008
sounds like the drivers temp door actuator is not working should be located on the drivers side of the air box down by the gas pedal or center dash area.
Posted on Nov 06, 2008
Did you check your coolant level or was it low and you added to it at some point? If so the system my need to be bleed or worst case the thermostat is going bad.
Posted on Jan 03, 2009
Blend door for passenger side or blend door motor has failed. Very big job to remove dash and work on it. Except the door motor is accessable from the glove box.
Posted on Apr 29, 2009
SOURCE: Only cold air on passenger side
I would first check and make sure that you have enough Freon in the system, on climate control dual systems only one side will put out cold air if the system is low on Freon. Eventually, both sides will put out warm/hot air if the system continues to loose Freon. As with all leaks the system should be checked and then the leak causing component replaced/repaired.
Posted on Jun 10, 2009
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