Murray AC Compressor Questions

[jellis56]

I am installing a Murray AC Compressor in my 2014 Silverado 1500. I have two questions I could use help with.

1. There is a screw in plug with a sticker on top that covers a tiny hole that goes through the plug. I took it out and verified the hole doesn't go straight thru, it's baffled or something to prevent oil from escaping.

I can't find any info on what this is for and I have not mistaken if for one of the low or high psi lines into the compressor. It almost looks like a breathing hole of some type.

2. What is the best method of adding new PAG 46 oil after dumping out the factory oil? Do I pour it in the low side port and rotate the clutch several times or a better method?

Thanks

[GM Tech]

HPRV otherwise known as High Pressure Relief Valve. It is a safety valve to release refrigerant if indeed the HPCO High Pressure Cut-Off switch does not shut off compressor.


Oil can be put in low side just fine---every compressor shipped to assembly plants has its belly full of all system oil..