Roadkill_Gaming

Hmm, I will check out the condenser as well. When I hooked up my gauges I had 0 psi on high and low side, and never smelt any Freon during the vacuuming down. My diagnostic tool was reading 5psi on the high side when it was around 80deg out. I'm pretty sure I had nothing in the lines to recover. Before I buy any parts, I am going to charge with 1 can of 1234yf-uv (8oz) to find the leak for sure.

The AC in my 2018 LTZ went out. I hooked up a manifold gauge set and put the system under 30inHg of vacuum. Over the course of two hours it dropped to about 27inHg. It makes me think a seal on the compressor is bad. I am going to throw some 1234yf (as called for by info panel on fan cowling) that is dyed to verify. When researching replacement compressors, I found GM Genuine 85656961; This is what GM Genuine's website reccomends based on my VIN. RockAuto lists that part number under GM Genuine 86798574, which does not exist on the GM Genuine site. The listing on RockAuto says that it is R134a. My truck has the 1234yf sticker. I know MY2017/2018 was the transition years for 134a to 1234yf Are the two compressors compatible? I know that 134a and 1234yf do not mix and use different fittings. Any help is appreciated. Rock Auto listing https://www.rockauto.com/en/moreinfo.php?pk=14080089&cc=3437551&pt=6628&jsn=1000 GM Genuine https://parts.gmparts.com/product/gm-genuine-parts-air-conditioning-compressor-kit-85656961