AC not working

BLAZERMAN67

MEMBER
2012 CHEVROLET MALIBU
2.5L
4 CYL
2WD
AUTOMATIC
68,000 MILES

When the car is at idle the system works, but as soon as you accelerate it blows warm air. I have remove the belt and inspected it and the compressor clutch and pulley. No issues detected. I put my gauges on it and my charge pressures are 50 psi low side and 180 high side this was at idle, once I accelerate the pressures change to approximately 100 psi low side and 40 psi on the high side. Then it blows warm air. I was thinking expansion valve but I am not sure. Please help.

The clutch was engaged the when accelerate.

Sunday, June 25th, 2017 AT 7:12 AM

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Are you sure the gauges are hooked up right? If it is it sounds like a blockage at compressor. Recheck your gauge hook up.

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Sunday, June 25th, 2017 AT 10:26 AM

BLAZERMAN67

MEMBER
1 POST

I rechecked the pressure, this time static was 120 on both and 120-125 with the compressor engaged. I'm thinking compressor is no longer pumping

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Tuesday, June 27th, 2017 AT 8:03 PM

HMAC300

MECHANIC
48,601 POSTS

If pressures stay the same as static it's a compressor problem bu if compressor went out it sends pieces all throught eh system so it h as to be flushed out and cleaned along with orfice/screen change if it has one as well as receiver drier before even putting new compressor on. Of course if compressor is not engaging then the pressure will stay the same.

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Wednesday, June 28th, 2017 AT 6:30 AM