Pontiac Repair: 98 pontic grand prix gtp, pontic grand prix, grand prix gtp

Question
QUESTION: AC was blowing cold air on driver side and hot air on pass side tired to adjust now blows hot air both sides

ANSWER: Hi Robert:

Sounds like you have an issue with temp door acatuator (S) being that it's a GTP it has to have auto (digital display) dual temp control. I'll assume the a/c is working with the a/c on the larger a/c line under the hood gets cold to the touch. If the a/c system isn't cooling then you couls have warm air on both sides even know the doors in the heatr hox are working. if the a/c system doesn't work you blowing air across a warm evaperator in the heater box thus the warm temp. so first off see if indeed the a/c is turning on and cooling and if so then you have a temp door probelm. if the a/c is not working that is why the warm air. good luck :-)


---------- FOLLOW-UP ----------

QUESTION: Where is temp door acatuator ?

Answer
there is one on each side of the hvac box under the dash sloce outs. take the close outs off both sides of the dash under the steering column and under the glove box and you will see them they have I think 5 wires on each one the left side (drivers) of the HVAC box has 2 actuators one is for the mode the other is for the temp control. turn the key to run and push the mode button you will see the wheel ton on the back side of the actuator so you know which one is the mode and which one is the temp. them move the temp up and down on the left side you will not see the wheel turn that is the actautor that is bad on the left side.