The conversion took place right before I purchased the car, about a month ago. The AC was colder at that point than it is now. I remember looking at the low pressure side (cold line into the evaporator) and seeing ice on the hard line right off the compressor. I don't see that anymore, but the line is still pretty cold. Its mostly been after I drained the radiator fluid and started the acid flush that I have noticed the temps seem weaker.

I do have a light hissing sound coming from my radiator cap now after the engine has been off for about 15 minutes or so. I'm thinking that means it needs to be replaced as its not holding pressure like it should. I don't believe that would affect the AC but just wanted to verify that the cap is bad.

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My first Mercedes
1983 300SD - 136K

1982 Toyota Supra - 160K currently for sale