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My GMC Envoy A\C Keeps turning off - 2002 GMC Envoy XL

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First take these steps. Your envoy has a low press switch and a high press switch. If to low it shuts the a/c off , if to high it shuts a/c off. If you had a set of a/c guages you could hook them up when the a/c is working you should have low side press around 30 to 40 and high side 200 and above. If low side is like 10 or 20 then its low on freon. being a 2002 it is a good chance you have a leak and lost freon over time. A shop can put it on a machine and evac the system and they can see how much came out in lbs. They can also put dye in the system when they recharge to find the leak. you can if you want buy a can from like walmart that has a hose and gage attached to it and hook it up and first look at your low side reading if below 30 then charge up system to get above 30. some of these cans also have uv dye in them so in the future when it leaks down again you can tell them it already has dye in it. that is what i would do first it takes care of alot of items. then write back if still having problems and then its on to testing high and low switches and so forth

Posted on May 25, 2009


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