93 300 Cabrio. Went to add refrigerant. Low side fittting and valve cover OK. High side - bigger plastic cap, on there pretty good. A twist with some pliers and it came off, and valve below began to hiss. This is bad, so put cap back on. Crank car, and pressure blows cap off into the bushes. Look at cap and realize it must have been from the R12-R134a conversion program, it was glued in place by something like green Locktite.

As I stood there, listening to my refrigerant vent, I recalled that it was expected to be 95-96 today.

So is this conversion an adapter that is screwed into the original valve? What do I ask for at the parts counter or look for at the boneyard? I have my own vac pump and gauges.

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91 300 TE 235K
93 Cabriolet 155K sold
92 300 TE 200K boneyard