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Randy, GMC Technician
Category: GM
Satisfied Customers: 9483
Experience:  25 Years experience
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AC issues, need help troubleshooting to determine what parts

Customer Question

AC issues, need help troubleshooting to determine what parts may need to be replaced.
Submitted: 1 year ago.
Category: GM
Customer: replied 1 year ago.
For the most part, the AC will not blow cold air in the front or the back. Sometimes, it will work for 10 minutes and then cut out. I have charged the system and still no improvement.
Expert:  Randy replied 1 year ago.
Does the compressor cut of or does the air stop blowing when this happens?
Customer: replied 1 year ago.
Air continues to blow but it is hot.
Expert:  Randy replied 1 year ago.
okay, that sounds like the compressor is not staying on. Does the ac light on the controls blink or go off when this happens? Can you hear the compressor clutch disengage when this happens?
Customer: replied 1 year ago.
The light on the controls stays on and I can't tell if the clutch disengages or not.
Expert:  Randy replied 1 year ago.
okay, have you had the obd codes scanned?
Does the check engine light stay on?
Customer: replied 1 year ago.
Have not had the codes scanned but the Check Engine light is on.
Expert:  Randy replied 1 year ago.
okay, with the check engine light on indicates there is an on board diagnostic code stored in the computers memory. That code will help pinpoint the issue with the ac. It could be an electrical issue like a bad sensor etc...
You can get the codes scanned at most of your local auto parts supply stores like advanced auto and autozone.
Customer: replied 1 year ago.
ok, I will get the codes checked and let you know what I find.
Expert:  Randy replied 1 year ago.
sounds good. Let me know the code numbers and I can get you the repair info.
Customer: replied 1 year ago.
Ok, got the codes but none of them are related to AC.
Expert:  Randy replied 1 year ago.
okay, does the engine coolant temperature gauge work normally?
Does it stay in the normal range?
Customer: replied 1 year ago.
Yes, normal range when driving
Expert:  Randy replied 1 year ago.
okay, open the hood. Then Start the engine.
Place the blower motor switch in the maximum speed position.
Place the A/C request switch in the ON position.
Place the air temperature switch in the coldest position.
Listen for the ac clutch, does the A/C compressor operate normally when the air stops blowing cold?
Customer: replied 1 year ago.
At the moment, the air is blowing hot all of the time. What am I looking for with the compressor to consider that it is operating normally?
Customer: replied 1 year ago.
I started the engine and turned on the AC with the fan on full blast. There is an audible difference other than the sound of the blower. The pully on the AC compressor is spinning, if that makes a difference.
Customer: replied 1 year ago.
Sorry missed an important word... There is no difference in the sound coming from the engine when the AC is or Off, other than the blower motor.
Expert:  Randy replied 1 year ago.
Okay, it sounds like an issue with the compressor. It will be difficult to troubleshoot, the compressor is controlled by several sensors and relays. It will require a diagnostic scan tool to determine the issue.
Customer: replied 1 year ago.
So off to a repair shop for the diagnostic scan, thanks.
Expert:  Randy replied 1 year ago.
Your welcome.