Quote:
Originally Posted by 365gtb4
I think I found the problem. The low pressure schrader valve is not releasing allowing freon to enter the low pressure side. The "new" r234 adapter is not depressing the second schrader valve.
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I had exactly that same issue when I converted my to R234a.
The problem ended up being the old R12 original schrader valve pin being bent just slightly. I replaced it and continued on.