I got a G. Cherokee Limited earlier this year and I have been working on getting things how I like it. The previous owner took out the AC Compressor citing it was the cause of a vampiric energy drain. I found the real issue, and sorted it out, so now I am putting the AC compressor back in.

I can't find the high side service port. I have spent the past two days looking tracing the lines and I can't see it. I know the low side is at the back of the engine bay on the passenger side.

tl;dr, where is my high side service port?

 

Welcome to the forum.

The high side port on my system is on the compressor.

When I purchased a replacement Densor compressor, it came w/ a dummy plate that I had to swap for the original plate. The dummy plate only had a high side port Schrader valve / cap. It didn't have the port for connecting to the vehicle plumbing, or the safety valve.

When I swapped to the original plate on my new compressor, it had everything I needed.

 

That would explain it if the High pressure port is on the Compressor itself.

 

I know on my 99 GC Laredo, its on the hard line right behind the radiator on the passenger side. It has a black cap on it, so it's hard to see.