L31MaxExpress
I'm Awesome
High Side Port
On another note, I will be replacing the high side port this next go around. I did not replace it with this last winters overhaul (didn't realize you could remove it) and I suspect it might have tiniest of leaks. I can just barely hear a hiss of pressure when I remove plastic cap.
My question is do I install GM part with black rubber ball valve, or do I install the Dorman part with standard schrader valve?
Note, I even picked up the proper socket for the job. Mastercool 98234
I will only use the Dorman and refuse to use the nylon ball garbage. I had an OE replacement fail immediately numerous years ago on the Tahoe. After the high side was opened by the manifold set while vacuuming the system it failed to re-seat.
Since we are on the service fitting topic, on R134a retrofit fittings I use the steel fittings designed to thread on the R12 fittings with the shrader cores removed and also use a little blue loctite on the threads to promote sealing.