why the air condition system compressor getting damaged frequently for my cheve 2005 ls?pls advise its the second time i changed the compressor

If you take your car to a A/C service place, They draw a vacuum and check for leaks. If it checks out, they refill the system. This should have been done after the compressor has been replaced to evacuate the air.

That's what they are supposed to do and put a little oil in there to lube comp. Whoever did it last time must have flubbed the job and maybe even knew it, but sent you down the road Anyway. If it was done professionaly It should have lasted way longer. Try To go back and at minimal get a discount.

It's put under a vacuum to boil out any moisture because when water molecules touch refrigerant the water turns to ice and clogs the orifice/ txv, the vacuum has minimal to do with air.

So John, what about the question at hand? What's your professional opinion?

Defective compressor or as Jim said it wasn't installed properly, or as tom said it may have been a leak from the beginning misdiagnosed as a bad compressor and the leak never got fixed so the system is empty again. The answer has already been postedi was only imputing on the reason for vacuuming the system. The air gets pulled out completely within 5 seconds of the vacuum being applied. A vacuum needs to be applied for at least 15 minutes to boil and suck out the water molecules. Unboiled water molecules will also give a false leak reading under a vacuum. A few typos in there but the mobile page of cargirus won't let me fix them, there inputting was spelt wrong and spaces were missed.

And Mooney you are correct. There is a shop back in my hometown that intentionally messes stuff up and sends people on their way with more issues than when hey came in...

One has to hook up your gages an know how to read your pressures.Reading these suggestions make me realize you guys have not got a clue what your doing.The blind leading the blind.This Chevy Aveo car has a history of a bad OEM a/c compressors.In most cases the compressor an blower turns on but the low side pressure reads 90 lbs. An high side normal 200 lbs depending on ambient air temperature..Low should be at 35 lbs.This problem is the compressor suction side failure.You will find this a/c blows warm air with plenty of 134a in the system.

If low side is 90 psi then the high should only be around 100 or 110 at the most. 90 and 200 means the system is way over charged and the high pressure switch isn't cutting off at 150 like it should be. Optimal pressure when the compressor shuts off should be high side hitting at or around it's max of 150 and the low being around its minimum of around 30. Either the high side will shut the compressor or the low side will shut the compressor off if the high side isn't close to 150 (45) before it shuts off then the system is over charged. When the compressor shuts off, the high side should be above 140 and the low should be below 40. 200 psi will start blowing o rings, much past that and tig welds on the evaporator or condenser will start popping. That is a sign of a failed high pressure switch and an idiot with a can of refrigerant. The closer you can get both those numbers to their switch limits the more efficiently it will cool. Over charged and under charged will have the exact same symptoms.

Is the compressor shutting off with the a/c switch. mine went bad had it replaced, then this week end I noticed that the compressor was running any time I turned on the fan. Have pulled the A/C relay (in the fuse box under the hood) it stopped running. I am now looking for the solution as the relay test good. Yes the A/C switch is off and indicates as such. See if that compressor is always on! From previous experience with A/C shouldn't run in cold temps and especially if you are heating the air and it is cold out side. anyone have a clue. and yes the people that did the work did it right, and are highly reputable.

There is more to the ac system than under the hood. I've done all the troubleshooting to include replacing the air compressor. Did you know that there is a 8X8 evaporator hidden behind the glove box? Not only that, but there is supposed to be a replaceable air filter also? Open the glove box half way, pull and remove it. On the left hand side you'll see a verticle plastic mold that is cut half way which makes the verticle mold actually two large pieces. Unscrew the bottom. Caution, there are hidden screws which you really need a flashlight to locate. finally at the bottom of the verticle mold there is a latch to push in and downward to open the area slightly, because the piece is still connected on the rear with other hidden screws. You can see the 3 1/2" X 8' X 8" evaporator. so now look under the hood on the left where your ac in/out goes in from your rear engine fire wall. Then look inside and see that the ac in/out pipes is connected to inside the passenger compartment behind the glove box evaporator. The evaporator looks like a small radiator. Eventually the fan collects outside dust which settles inside the small areas between the evaporator and causes the coolness to be wasted by the dust debri loged on the evaporator. When I opened to see my in the passenger compartment behind the glove box ac evaporator, there was no air filter! The air filter that I bought was 1/2" X 8 X 8. Again my Aveo ac evaporator behind the glove box had been running behind the glove box for 79864 miles without an ac evaporator filter. It was caked with debris! I have a small air compressor and have blown the dirt and dust through the evaporator, placed the filter, rescrewed, and placed the glove box back in it's slot. That is the problem which is causing the ac compressor problems and causing undue evaporation and pressure on your ac system.

You can’t go from the a/c is working fine to overcharged unless there was a service procedure performed. The compressor has failed. The low side pressure should drop when the clutch comes on. The high side pressure should increase. Ambient temp affects the high side pressure and along with air flow through the condenser. 25 psi low and 150 ps8 approx on high side. Why the compressor keeps failing is a great question. Failure analysis is required. Did the shaft fail? Valves fail? Piston come apart? Is the system contaminated with metal debris? You may have a parts warranty case if the reman/ rebuilt compressor had a weak part reused. Guys, bad information is just as bad as faulty parts.

I I have a CheviI have a 2007 Chevy Aveo and why is it that when I am driving down the road And when I hit a bump in the road my AC quits working and then when I hit another bump it starts working again.