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Are you saying the valve on low side where you add freon ?
Yep that one. Which was tricky to find because adding dye puts lots of dye there. Anyway a balloon placed over it does inflate so I know it is leaking gas.
Clever idea! Mine leaks at both high & low side service ports, but it has ball-valves instead of schrader valves. (Fails soap bubble test). So I just used caps that have a built-in rubber O-ring. I'll try your balloon trick, to see how well these caps are sealed. I'll replace both ball-valves next time it needs to be evacuated.
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