also cold.
I get pressures in line with those you mention.
Since I added the can of 134a yesterday, the system works MUCH better
I probably added a lot less than 12 oz, since I purged the gauge liens for about 10 seconds each. How long should I purge them?

Ambient temperature is about 60 F. It took half an hour or more for the can to boil off into the refrig system. Is that normal?

I have a lot less bubbles in the sight glass, but still some. Shoiudl I add more R134a?

The system has been running OK for years, but the refrig cold plate getting slowly slower to cool. The piping layout gives the freezer first call on liqid refrigerant coming out of he condenser.