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Jerry, Master Mechanic
Category: Dodge
Satisfied Customers: 1754
Experience:  ASE Master tech, 30 years exp. troubleshooter, driveability tech
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GMC Yukon XL 1500: I have a 2003 Yukon XL 1500. When it starts

Customer Question

I have a 2003 Yukon XL 1500. When it starts up cold, the AC works fine, and will keep going for hours. But, once hot, if you turn the car off, then return to the car and turn it back on, the AC doesn't work. Could it be the low pressure or high pressure switch?
Submitted: 2 years ago.
Category: Dodge
Customer: replied 2 years ago.
The mechanic he removed all the refrigerant and replaced it back, and it had all the right pressures. He had an associate drive the vehicle 50 miles, and the system worked fine, at 40 degrees F. Then we took the vehicle on a 300 mile trip. Worked fine, but we never shut off the engine. We headed back, once stopped to get gas. It worked after that, but an hour later, we stopped to eat, and then it wouldn't work.
Customer: replied 2 years ago.
This same scenario has happened about 5 times in 2 weeks. If started up from cold, the AC works, but after the engine heats up, and we turn off the power, then back on, it will intermittently not work.
Thanks! The vehicle has 260,000 miles.
Expert:  JacobTD replied 2 years ago.
It sounds like the clutch for the compressor is failing to engage. Usally cycling the ac on and off will bump it on. Also its not a bad idea to exchange the compressor oil and r134 making sure that its all charged up to the recomended pressures. Try cycling ac first