Hi candyman46136. Welcome to the forum. Which engine do you have? Do you have normal pushbutton heater controls or automatic temperature controls? What is the system not doing? No fan? Air blows out of the wrong vents? AC doesn't cool? Did all the windows stop working at the same time or just one of them?
With the engine idling, unplug the two-wire coolant temperature sensor, not the single wire sensor. That one is for the gauge on the dash. When you unplug the sensor, the radiator fan should turn on in about two seconds, the Check Engine light will turn on, and a diagnostic fault code will be memorized in the Engine Computer. That code will erase automatically later. If the fan turns on, the system is working. If it doesn't turn on, listen for the click of the fan relay. That will help determine the next step.
If all the windows stopped working at the same time, check for broken or frayed wires between the driver's door hinges.
Thursday, June 10th, 2010 AT 3:26 AM