I finally decided that I better get the AC charged up as it’s starting to get warm here.
As the R134a was getting sucked in (engine running) I started to see cooling leaking from the radiator cap.
Over the last few months I’ve sometimes got a whiff of antifreeze but never could find the exact source.
The cap is rated for 16PSI and should have gone into the overflow. I have noticed the overflow tank has always needs some added to it.
Checking the coolant system pressure with the engine running at temp it was only 7PSI. I bought a new cap today, will check it out tomorrow.

So back to the AC, the temp coming out of the vents was 29ºF. I suspect my cheapo digital BBQ gauge is a few degrees off.