Hi my name is John.
You will need to go to the dealership to have them read the codes in the ac control head to know for sure what is going on.If find out the codes I can tell you how to test it and repair the problem.
Remove ignition switch bezel
3. Using a trim stick C-4755 or equivalent, disengage the locking tabs attaching
instrument panel center bezel right and left side.
4. Remove the three screws that secure the A/C-heater control to the instrument panel.
5. Remove the A/C-heater control from the instrument panel and disconnect the two wire
harness connectors from the control
This is how to remove the ac control head and check to see if the connector is loose or there is a push out pin.You can also put a little bit of dielectrial grease on the pins.
Let me know what you find out.
Sound good let me know when you find out.
I insisted that the dealer replace the AC-Heater control unit. They did. I still have the original problem. For two days we had intermittent AC going from Syracuse to Florida Friday& Saturday. SundayDriving around for Groceries, No problem.
Is there a damper located at the heater which would prevent any flow of heated or cool air to the rest of the vents. I wish I could get a schematic of the heating a cooling system. there is no doubt that one of the main dampers is getting stuck closed.
There is the blend door inside the heater box and the power module that control the blower motor speed.
What codes did they get out of the computer?
Thank you,if you need more just come back to this question