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A/C blows hot until 2,500 rpm

Teakwo23 on Sat May 31, 2008 1:02 AM User is offlineView users profile

Year: 2001
Make: Chevy
Model: Camaro SS
Engine Size: 250
Refrigerant Type: R-134a
Country of Origin: United States

I'm having an issue with a car I recently purchased. When I turn on the A/C it will blow hot until I rev the engine to 2,500 rpm. It doesn't matter how long it sits there. It will not blow cold until 2,500. The A/C is ice cold while driving after I rev the engine. Now, is if I punch it to the floor the A/C blows not as cold. I have to turn the A/C off, turn it back on, and rev the engine again. The A/C will stay cold under normal driving conditions until I punch the gas hard. Ive had it checked by a professional and they can't figure out the problem. The freon is fully charged. Any idea whats going on?

GM Tech on Sat May 31, 2008 1:14 AM User is offline

Is the clutch engaged all the time? If so I suspect a sticky control valve on the compressor- which is replaceable.

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

NickD on Sat May 31, 2008 7:25 AM User is offline

Clutch gap is another issue, was that checked as well? Idler pulley has a machined face as does the clutch hub, when cold that distance should be between 20-30 mils, easy to check with a feeler gauge. If it's greater required that higher speed vibration of the engine to help pull it in, can be adjusted with the appropriate tool and also a common problem.

Can also be a tad of dirt on the clutch relays contacts, again engine vibration can correct that, but either problem will get worse with time. Both are easy to check and correct.

Edited: Sat May 31, 2008 at 7:39 AM by NickD

Teakwo23 on Sun June 01, 2008 12:05 PM User is offlineView users profile

Thanks guys!

Teakwo23 on Sun June 01, 2008 12:07 PM User is offlineView users profile

The clucth doesnt engage until I rev the motor

Teakwo23 on Sun June 01, 2008 8:47 PM User is offlineView users profile

How do I adjust the idler pulley?

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