Silverado A/C Guru's INSIDE
07-18-2012, 10:24 AM
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"97 A/C..controls shorting out..
Just had my "97 Silverado X-cab to a reputable service facility to have the A/C recharged. They evacuated the system, vaccuumed it and replaced Orings at the compressor and recharged the system. I picked it up and it worked fine that day and the next day. The next morning I started it up and turned the A/C on and ... NOthing but heat at the floor and windshield. Could shut the fan down and back on but not to HIGH speed. I took it back to the shop and they worked on it again.. replacing the HVAC control panel in the dash.. test run it and test drove it around town. I picked it up and drove it home.. about 6 miles and it quit again same thing ..no COOL ..just HEAT to the floor and windshield again. I took it back and they checked it again and again replaced the HVAC control panel.. checked all wiring and grounds and test run it ..all was fine..AGAIN. I picked it up and drove it home..just 6 miles and .. the same thing again.. WHAT are they missing..? They said I should take it to a GM Dealer that there may have been a recall on something in the system. DO you have any Ideas..?? HELP.. 
10-05-2012, 02:19 PM
#22
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Just had my "97 Silverado X-cab to a reputable service facility to have the A/C recharged. They evacuated the system, vaccuumed it and replaced Orings at the compressor and recharged the system. I picked it up and it worked fine that day and the next day. The next morning I started it up and turned the A/C on and ... NOthing but heat at the floor and windshield. Could shut the fan down and back on but not to HIGH speed. I took it back to the shop and they worked on it again.. replacing the HVAC control panel in the dash.. test run it and test drove it around town. I picked it up and drove it home.. about 6 miles and it quit again same thing ..no COOL ..just HEAT to the floor and windshield again. I took it back and they checked it again and again replaced the HVAC control panel.. checked all wiring and grounds and test run it ..all was fine..AGAIN. I picked it up and drove it home..just 6 miles and .. the same thing again.. WHAT are they missing..? They said I should take it to a GM Dealer that there may have been a recall on something in the system. DO you have any Ideas..?? HELP..
A few things:
1. There is a gm advisory that advises the complete disconnect of the low pressure switch, which is known to be problematic. There are also other advisories that recommend examining the harness for shorts/chafing. Does the system work properly with the low pressure pigtail jumpered ?
Code:
LOW CHARGE INDICATOR FLASHES DISCONNECT CHARGE DETECTION #92-1-118 - (May 13, 1992) SUBJECT: A/C LOW CHARGE INDICATOR FLASHES (DISCONNECT LOW CHARGE DETECTION FEATURE)
2. I found 2 shorts in the dash where the heater wiring harness meets the cassette deck bracket, which is very sharp. Also found prior electrical tape down there.
3. Located a short in the harness where it comes around the top of the engine below the passenger side of the air filter, the wire was worn through the insulation .
4. Do you smell any burning coming from the dash control unit?
I'm keeping track of my progress here, still don't have the problem solved but i feel like i'm making some ground:
AUTO: GM Trucks: Resolving AC issues | oldtimeynerd.0
Luck!
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