When do you need to access high side? Probably none :-) Jim Caldwell wrote: I' m doing a conversion to R134, as the system lost its charge. It is an 85 Mercedes 300SD. Lo side adapter fits fine, but the hi side adapter does not. The hi side valve is right between the left headlight and the A/C condenser and fan. I have a std aluminum hi side adapter for R134 quick-disconnect. The valve on the car is narrower at it front end (probably wide enough for about six threads), but this front part has NO THREADS. They were'nt stripped off, they were never there. It is 90 MM wide. The rear part of the valve (which is 110 MM on the outside of the threads) IS threaded. Problem is, that there needs to be threads on the narrower front part of the valve, not on the rear part to work with this adapter. As it is, you can "screw" it on, but it is not really engaging any threads, so you cannot tighten it up and make a good o-ring seal. The adapter has threads cut on its narrower inner ID where the o-ring seats, but the wider part towards the outside of the fitting has NO threads. IE, the thread location is backwards. ( Would take 5 seconds to SHOW someone the problem, but is much harder to describe -;) Do I need to get some special adapter at the Mercedes dealer?
- posted
20 years ago