Question about 2001 Chevrolet Silverado 2500HD

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Air conditioning At an idle my ac blows hot air and when driving cool air. I put a gauge on the low side and it is reading about 100 red zone

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It sounds like you over charged the system, the low side should be 40psi to 50psi with the A/C on high and the high pressure side should read 150psi to 200psi. Anything different, you need to get the system service and try not to use your A/C to prevent the compressor from any damages. Good luck and hope this helps.

Posted on Jun 15, 2009

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