My rear a/c works perfectly. My front a/c will work all day sometimes and other times not at all. Some days it goes back and forth from hot to cold. I've checked the pressure and refrigerant levels and they are normal.
I've read posts online and seen everything from blend doors and actuator motors to evaporators and thermostatic switches, but, none of the symptoms for those items quite fit my situation.
Is HVAC manual or Automatic? If automatic a scan tool can be used to perform self diagnostics. This will test each sensor and actuator to find problem
June, 7, 2012 AT 6:41 PM
It's manual. Does the fact that the problem is intermittent sound like a sensor or actuator issue?
June, 8, 2012 AT 2:28 PM
Yes blend door actuator loacated behind center dash controled by potentometer. Find actuator operate temp control motor should respond by moving from cool to hot. Being intermittent is going to make repair difficult
June, 8, 2012 AT 3:33 PM
The next time it goes warm, leave the front on and the rear off and feel the temp of the line coming out of the evap to the accumulator and see if it is cold. If so, you have a blend door or blend door control issue.