Air Conditioning problem
1990 Buick Electra 6 cyl Front Wheel Drive Automatic 275000 miles
How do I decide what the problem is with this automatic HVAC system? Got the car 3 days ago - was told the AC blew erratically, blowing out the defrost if fan speed on HI or not at all. Controls are electronic, automatic with only 3 fan speed options: LO, AUTO, HI. The blower worked fine when I connected the terminals directly to battery. There is a creaking noise each time the system is turned on initially but no air flow. None of the fan speed controls affect anything. No blower noise at all. None of the control panel buttons do anything. Compressor works, condensor is cold and sweating. At highway speeds, seems like some minimal cold air comes out of the dash vents. How do I know if its the Blower Control Module or the the control panel itself that is the culprit? Or could it be something else simpler? No fuses blown but don't know how to check relays or resistors. The + lead to blower motor is hot when disconnected from motor; dead when connected, with & without AC turned on. Is that the way its supposed to work?
Monday, September 20th, 2010 AT 12:29 AM