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A/C won't blow cold air

Turfman on Sun April 12, 2009 10:20 PM User is offline

Year: 1999
Make: Chevrolet
Model: Cavalier
Engine Size: 2.4L
Refrigerant Type: 134
Country of Origin: United States

Hello, I have a 1999 Chevrolet Cavalier with a 2.4L engine. The A/C has started to act up for the first time. The car has about a 165,000 miles. When you turn on the A/C button on the dash the compressor would NOT engage. I checked all the electrical connections and they seem fine. My next thought is that it is low on refrigerant. I then purchased a can of interdynamics Arctic Freeze Ultra Synthetic 134A+ refrigerant with a pressure fill gauge on top. I filled the system up to about 25psi on the gauge. The compressor finally came on. I filled it to about 35psi. This was in the "filled" zone (blue). The compressor continue to operate ok with no bad or unusual noise. Still no cold air at all. I drove the car a highway speeds but no cold air. When the car is idling and the blower is on low you can hear the evaporator "hissing" but it did this when we bought this new. Do I have a bad compressor? Any suggestions would be greatly appreciated. Thanks!

chris142 on Sun April 12, 2009 10:29 PM User is offline

You cant properly charge a system with a can and a low side guage only.

The others on this board are going to tell you to get high and low pressures because we can't help w/o those.

Turfman on Sun April 12, 2009 10:35 PM User is offline

I will put my gauges on it and try and get some readings

mk378 on Mon April 13, 2009 7:37 AM User is offline

Finding the pressure at zero means there is a major leak. You would need to recharge nearly the whole system capacity (by weight) to have it cooling again. That would be more than one can. Of course if you did that it is still just going to leak out again.

Do not use any sort of "stop leak" product, they do not work, and will ruin your system.

The most common leaks on GM systems seem to be at the compressor. Either the shaft seal or the compressor case joints.

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