I have a leak on the expansion valve of my 420 sel. The leak is not at one of the four pipes transporting the refrigerant. It is at the fifth opening or plug or cap or whatever it is. I assume it is to adjust flow. At any rate, is there a seal that I can re fit into this port or must I buy a new Valve. Removal of this valve requires special tools and a good back. I have neither. If I buy a new valve and tools, and manage the job OK, is there any one who knows if this is an adjustment and how to adjust it???
The system is R12 and I have plenty. About 200 lbs. I am a licensed refrigeration person (not in the mobile field) and must repair leaks, I cannot just keep dumping in R 12.
Ron

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