I discovered a leak of r134a refrigerant from the bottom of the A/C compressor. There is a nut on the bottom of the compressor that looks like some kind of relief valve and this is what is leaking. Does anyone know anything about this leak, why it happens or how to fix it? Is it something I can fix myself like a gasket or something I shouldn't mess with? I know the dealer will charge me an arm and a leg. Is it even something that can be fixed or will it result in the need for a new compressor? If it is a relief valve I guess it may be functioning properly and the problem could be elsewhere. Perhaps just having the system purged and refilled at the proper vacuum pressure will solve the problem. Any ideas? Thanks!