Automotive Air Conditioning Information Forum (Archives)

dorosko on Thu August 05, 2010 8:21 AM

Year: 2000
Make: GMC
Model: Sonoma
Engine Size: 2.2
Refrigerant Type: 134a

Okay, I just bought a GMC Sonoma and it isn't blowing cold air. I know that the clutch is engaging and the low-pressure side drops when you turn on the ac and drops more when you rev the engine. The hose returning to the compressor is not cold. I don't have a real low pressure gauge and no high pressure gauges for 134. Any suggestion on what my problem might be or how to better assess the situation? Thanks

GM Tech on Thu August 05, 2010 8:44 AM

Number one mobile a/c failure mode- loss of refrigerant due to a leak-- measure the refrigerant in your system- find and fix leak and evac and recharge to factory spec

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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......