The used compressor I installed mid April took a crap on me. This week was in the 90°s and the AC was blowing mid 70°s. Ordered the Chinese Nissen others have been using.
Delivered late Friday, so I start pulling the junk compressor. I did it slightly different than I normally would. I wasn’t going to swap the drier or TXV, since they were practically new. I got the compressor on the rad support and used hose pinch off pliers on each hose, close to the compressor. I had the vacuum pump and gauge set hooked up, ready to go.
Dumped the PAG the Nissen came with. Quickly disconnected the used compressor and dumped it. Refrigerant is sneaking past the pliers, so work fast. Matched what was in the used oil container with new DEC PAG and injected it into the new compressor.
Get the new compressor on the rad support and install the lines. Start vacuuming….
I was only seeing -20hg, when I’m used to seeing -29. I’m thinking either the pump isn’t strong enough or my gauges are faulty. I added Teflon tape to the manifold charge fitting, because I had a tiny leak. The manifold fell off the bench and hit the ground hard. I decided to let it sit overnight to see if it held vacuum, which it did.
Dumped in half a can under vacuum, and noticed the high side didn’t budge. Then noticed the needle was on the wrong side of the stop pin.
Weighed in 41oz and called it good. Yesterday was 92° and today is 72°…. Not a great day to takevent temps, but it is what it is…
When I disconnected and drained the gauge set, I noticed the low side was showing 5psi. I guess I figured out why I was only pulling -21 under vacuum. Reset the needle to 0.
I heard something bouncing around inside the used compressor when I pulled it. I have a good feeling I found the issue…
That nut won’t thread onto the control valve without the control valve spinning. The threads are slightly buggered, but nothing in the rear rotates. I’m not sure how that nut would come off. It may be fixable, but it’s going to the scrapyard with a bunch of other compressors. Unless I pull a compressor from a running car and mark it good, I’m done with used parts.
-Todd