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Review on Dorman 902025 A C Port Cap by Bruce Marable

Revainrating 5 out of 5

Insurance. in exhaust and emissions

Absolutely great! I highly recommend this for any GM vehicle using the R-134a system. A bit of Nylog Blue on the threads and you can screw it up or down (or both). It is excellent for sealing and preventing freon from leaking through the service port valves. I went ahead and replaced the high-pressure port with a Schrader valve instead of the leaky rubber bulb that GM uses, but that cap is my insurance. I've installed it on my other cars too.

Pros
  • Great product
Cons
  • Only available in black