I do have power and will have to check for ground at the module. I have power but no ground at the fan motor connection with the fan control switch on (any position) so likely no ground at the module. I believe you're right, it is the IPC I was referring to (the parts department called it a temp control head). I have lights on the IPC so I figured there is a ground at least to that. The fan may have a dedicated ground however. In looking at the wiring diagram for this car it appears that HVAC runs through the DIM but I'm not completely sure. If so, that is the one major component I have not replaced. It also appears GM uses a constant power and then runs the unit by completing the ground at various resistances.
Beautiful car, just plagued by lots of electrical problems and a leaky trunk.
Monday, August 10th, 2009 AT 10:54 AM