let me interject,
The cap is to keep the dirt out of the valve and hence a/c system. It's not meant to "seal" the system. Your car most likely needs a new shrader valve. This is a very common leakage point.
Do you need to discharge your system for replacement? *NO*. You can buy a special tool for R&R the valve with the system full and it should cost you about $25-35 plus $2-5 for the valve.
This is a 10-15 minute repair job!
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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