Let me get a clarification please, your controls are digital, and the numbers do not change when lowering to the desired temperature? Or the digital readout lowers, but the A/C blows hot?
This sounds like a temperature blend door actuator that is not working.
Run the self diagnostic test on it by turning the key to on, then press off and floor at the same time, then within two seconds, press auto, If there is a problem a trouble code will appear on the display. To exit self test, press the blue, cooler button this also retains error codes, To erase codes and exit, press defrost, choose one of these before you power down the system. Test with engine at 120 degrees or more, and cabin between 40 to 90 degrees. Post any codes recorded here and I let you know what is defective.
Here are the wiring diagrams for the air conditioner so you can see how the system works.
There are 6 fuses that run the system lets start by checking them by using the wiring diagram to show you the fuse numbers below.
Check out the diagrams (below).
Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Friday, June 4th, 2010 AT 5:58 PM