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The most common cause of this is that you have a stuck air temperature control blend door, this can be a motor actuator issue or a jammed door or both (common). To replace both parts you will need to completely remove the dash from the car to access the blend door.
u have a blend door inoperative. if u have dual climate control(passenger/drivers seperate heater/air controls u may have a defective switch or a defective interior air temp sensor. possible bad blend door motor as well-hope this helps
Check whether the warm air isn't going in with the cold air .Coolant line that runs into the firewall on the passenger side of the engine which is toward the bottom half of the firewall on the passenger side. If there is warm air going into the vents with the cold air then it blows warm air. You may have to shut it manually because it gets stuck sometime. Check it out.
2004 Suburban air conditioner blows hot air to the dirver side but cold air to the passenger. This does not happen all the time but has occurred several times this last summer.
You need to replace the driver side temperature door control actuator. While doing this... make sure you bolt the new one in AND THEN PLUG IT IN or it will spin and not line up in the right place... then there is a series of crazy steps to fix that problem.
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