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Replaced ac compressor, won’t kick on to charge system

Replaced ac compressor, won’t kick on to charge system

Postby Adramer [OP] » Sep 12 2020, 12:09am

I recently replaced the ac compressor, condenser, and expansion valve in my 2014 Silverado 5.3. System has the right amount of pag oil and all electrical is hooked back up correctly. Once everything was put back together I vacuumed the system and checked for leaks (no leaks). Started to charge the system but the compressor will not kick on to pull the R-134a refrigerant. I’ve check the fuse and we’re all good there. Light is on in the cab and the fans kick on when you have it on high. For the life of me I can’t figure out what it could be. Any help would be much appreciated!
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Re: Replaced ac compressor, won’t kick on to charge system

Postby 19trax95 » Sep 12 2020, 1:47am

It won't kick on if its empty.

What method are you using to charge it? Just trying to suck it out of the little cans? Really isn't the best way since you won't know how much your really putting in. If your doing it out of the larger cylinders make sure you have a decent scale to accurately weigh what you put in.

You can jump the pressure switch and it should let the compressor kick on.
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Re: Replaced ac compressor, won’t kick on to charge system

Postby Adramer [OP] » Sep 12 2020, 2:47am

I am using ac test gauges to fill the system with 12oz cans. The pressure was in the high 80psi range and the compressor never kicked on. I tried jumping the switch but when the switch is unplugged it won’t let the truck turn over. May try and take it to a mechanic tomorrow to see if they can charge the system.
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Re: Replaced ac compressor, won’t kick on to charge system

Postby Walkers » Sep 12 2020, 3:47am

Just apply 12v directly to the clutch, it’ll kick on.
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Re: Replaced ac compressor, won’t kick on to charge system

Postby Adramer [OP] » Sep 12 2020, 4:44pm

Update, just jumped the relay for the compressor. Had a bad relay, quick trip up to the auto parts store and it’s blowing cold. Thanks for all the help!
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