No AC, Heat, or defogger--Climate Control??
My 2001 Grand Cherokee with dual ATC seems to have lost its ability to do any HVAC function. I have no heat, no AC, no blower, no rear window defogger (though I can hear it clicking when pressed), and no lights related on the ATC display in the center console. I checked the blower control motor and the connections were not burned out as I thought might be the case after looking at wjjeeps.com. I don't think it is the blend doors, since I do not have a hot/cold issue (I have nothing), and I don't think it's a resistor since the fan does not work at any speed. The darn things just seems dead. Have also checked fuses, and they are fine.
So I pulled the climate control unit out and was heading to the auto store, when the thing came to life for a few minutes. I've tried moving/pulling wires to see if either of the two plugs at the back of the CCU are loose, but it does not seem to cause or solve the problem. I pulled apart the CCU looking for obvious breaks, but saw nothing (and the unit came back to life as noted above after I did this).
I tried to get error AZC codes when it was working , and I got these (all of which I got with the unit loose in the console area): 39, 42, 43, 44, 58, 59, 60, 61, 62, 63, and 64. I am not sure, however, if they are historical or current codes since it was "on" and running when I got them, but I can't get the darn thing to turn on again to check. Several of the codes refer to lack of a "bus message," so maybe that is the problem. Can anyone tell me what the bus message codes mean?
I'm inclined to replace the climate control unit and see if that solves the problem (though it could be a wiring issue upline), but any thoughts would be much appreciated.