Date registered: Sep 2004
Vehicle: 1985 500SEC, 1991 190E 2.6.
Location: Los Angeles / Hannover Germany
Mentioned: 11 Post(s)
Quoted: 937 Post(s)
I think you need to post on the car specific R 129 forum with more information. Is the system empty (has leak), or is it still cool and just low on coolant. Check out mbbraingears.com and the russian mb website for an online service manual. The search this forum function on the top right will get you to the links and all A/C threads in the archives. If you dont find it, go to the W 126 forum and the 'do it yourself' (DIY) thread for the links. I would stay away from general refill cans that are supposed to be used on R-12 systems without being R 12. The fittings on an R-12 system are different from R 134. I am reasonably handy with tools, but would not touch my A/C. The system is under vacuum/pressure and you can not mix R 12 with R 134. If it is empty, the leak has to be found and fixed. If the system does not get used periodically, the compressor seals will dry out and leak. In any case, after system opening, the dryer needs to be replaced, and the system evacuated with a good vacuum pump, to get everything incl. moisture out. If the system can hold a pre determined vacuum over a period of time, you have no leaks. I have an A/C expert do my stuff privately. Good luck.