I have a 2016 silverado 6.2L. I replaced the low pressure port Schrader valve and now need to jump the pressure switch to get the compressor to turn while adding refrigerant since the system is at 0 psi. I can't seem to find the pressure switch. Any help is appreciated.

Jeff

 

not a good way to charge the system. the system should be put under vacuum and charged by weight. charging via a pressure gauge is not accurate.

you will dry start the compressor and have air in the system afterwards which will lower ac performance.

if you must; the pressure transducer is located right lower side of the condenser. its a 3 wire sensor so you will have to jump the ref and signal wires.

 

What tech2 said is correct. You need air and moisture out of your system at MINUS -30 PSI for 45 minutes to an hour and make sure it holds at that else you have a leak. I think you can rent an A/C pump at many car parts stores.

As tech2 said, the air in the system ain't good and neither is moisture. Then you can add the R-134A back, assuming you don't have a leak. You can add a leak detector as well very easily too. 0 PSI aint gonna cut it, Jeff. You need to do this right the first time if you want a really cold A/C system working for a long time.