My heater doesn't work. My ac works fine. The air blows at the coldest temp no matter what setting I put it on. From very cold to very hot it still blows cold.
Your control panel might be broke..
SOURCE: ac vent problem
Damper/flap for driver's side is probably stuck. Try moving the selector from cold to hot several times. Also, move the recirc/outside air control if the previous doesn't work.
SOURCE: 1998 Pontiac Bonneville heater problem
take the upper radiator hose use a glove and while the car is running squeeze the hose together and see if trys to open in your hand and if it doesn't you have a weak water pump but check the condition of the drive belt and the coolant before you go to the pump
SOURCE: heater wont blow warm/hot air
check your radiator coolant, thats what I did and it blows warm again
SOURCE: AC doesn't blow cold air, but refrigerant levels
The low side pressure seems ok the high side would help,Is your compressor cycling and is the air coming out even slightly cool?slight over charge cold effect cooling ability.I wish I could be more help. I will have to think about this one.maybe you could make sure your temp.door is actually in the commanded cold position.
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