It sounds like the A/C system has been converted to R134a. The old R12 systems use schrader valve service ports which are replaced with a new style port during the conversion. I attached a picture of the new R134a service port.
The R12 schrader valves are not removed, r134a ports are screwed onto them and act as an adapter rather than a replacement.It definitely doesn't have an adapter like that. Just an aluminum-looking cap on the original service port.
Are the R12 shrader valves removed when the 134 service ports are installed?
If so, maybe the system was converted, and he took them off to sell the car, and just placed the original caps back on the R12 ports.
Either way, I need to get the valve cores.
Hybrid - that's the first I've heard of a system NOT having a shrader valve. How do you get the system to take freon since the connected hose has nothing to depress to get the refrigerant in?You have service valves that do not use the shrader valve.
Thanks Joel - I guess that's what that other large cap is that's pointing forward just around the corner from the shrader type cap.You have to manually open and close the valve, There's two caps, one kind of looks like the schrader valve cap, then another long cap that covers a shaft, usually square on the end, that you turn to open and close the valve. If one or both of yours are leaking, replacements are readily available.