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Gene, Auto Service Technician
Category: GM
Satisfied Customers: 5495
Experience:  ASE Master 25 years experience, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.
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My AC is blowing hot 5 or 10 min after its started.

Customer Question

My AC is blowing hot 5 or 10 min after its started. Compressor seems to be working, and the clutch does engage. What could bee the cause.
JA: Has the clutch been slipping? Are you having any trouble shifting?
Customer: The AC compressor clutch has a new belt and tensioner.
JA: What is the model/year of your GM?
Customer: 2002 Chevy Silverado 6.0 engine
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Checked the freon pressure and is good. Changed the AC compressor clutch belt and tensioner.
JA: Anything else you think the mechanic should know?
Customer: Not that I can think of
Submitted: 11 months ago.
Category: GM
Expert:  Gene replied 11 months ago.

Hello, you checked the ac pressure with a set of gauges? Do you sem to have good airflow off the engine fan? If you put a rag on the front of the grill will it stay in place or fall down? Does the low side line appear very cold to the touch when the concern acts up?

Customer: replied 11 months ago.
Hi, the AC pressure is good, airflow is good off the engine fan. Haven't checked the low side line to see how cold it is to the touch.
Expert:  Gene replied 11 months ago.

What are the low and high side pressures when it gets warm

Customer: replied 11 months ago.
The low pressure side is above normal 50 psi the high pressure side is above 250
Customer: replied 11 months ago.
the compressor stops running
Expert:  Gene replied 11 months ago.

50 psi is too high on the low side unless it has factory auxillary air conditioning(rear unit)

Expert:  Gene replied 11 months ago.

Hello, do you need more help with this concern?