Car Tech forum: Jeep Grand Cherokee AC problem

2002 with the auto controls not manual.

Ok press down your ac and recirculation buttons and turn your left temperature knob clockwise so that it clicks once. (This needs to be done with the ignition in the on position.) The screen will say "00" or it will list two digit number and repeat itself write them down then post the number here and i will tell you if the on board computer knows what is going on with your a/c.

The 50 errors are stored errors they are not currently affecting your hvac system. However error 25 is a calibration error which according to my resources you need to replace the PCM module. I would bring it back to the place you had it done and have them double check that you don't have a loose ground or connector that they forgot to hook back up before you go and replace it.

The 50 codes say that the doors that direct air flow have to great of a range and there for they threw up that error. I would leave those alone until you get the 25 code fixed because those are stored codes.

I have a similar issue: If the A/C is on when I turn the headlights, on
the A/C cuts out and the heat comes on. At one time, turning the rear
defogger on would stop this, but now the rear defogger won't come on
with the lights on to "bypass" this bizarre arrangement. This is a 2004 Grand Cherokee V6.