I wonder if anyone here services a/c on cars as I have a related question. I have a car that appears to have an a/c leak. I have not done anything about it for 2 years but I decided to finally fix it. As a first step I was going to charge it with some R134a with a UV dye for inspection with a black light. Anyway, today I tried to hook up my manifold guage set (Robinair) and for some reason I am unable to seat the low side port - it just won't go on. The high side fits fine. I've charged this car before with these guages and never had any problem. Inspection shows nothing obvious.
I wondered if anyone here could suggest what the matter night be.