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It's called a schrader valve cap. It's slightly bigger than the cap over the tire valve. It's there to keep dirt out of the valve. Some of them even have and o-ring inside to help prevent refrigerant loss through the schrader valve. Go to any auto parts store and tell them you want a schrader valve cap for the A/C on your 94 Camry and you can get one for a couple of dollars. It's really not a big deal.
Incidently, your 94 should use R134A refrigerant.
Mike
Last edited by Mike Gerber; 07-05-2007 at 03:37 PM.
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