I have a 2000 Chevy Express with 122,000 miles. It has the high top Mark III conversion package. I recently had my local mechanic change the AC compressor and dryer. The front ac woks very well, but the rear ac is blowwing hot air. We pulled the access panels and found the rear blower and found the water hoses to be hot, ie the heater was running. Is ther a valve or vacum switch malfunctioning? The control switch for the rear ac is only a speed control.
Wednesday, August 29th, 2007 AT 7:07 PM