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Old 05-04-2001, 12:41 AM
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JCE JCE is offline
Down to the Wear Bars
Join Date: May 1999
Location: So Kalifornia
Posts: 2,189

Although i am not a tech, I just went through this process on my '87. When mine started running cool instead of cold, the Tech added dye to the r-12 system and had me bring it back after using it for a week. This isolated the leak(s) that needed fixing no matter which R coolant you use. He then captured the r-12, fixed the leaks (fortunately just 2 bad 'O' rings), replaced the receiver/drier and expansion valve, and evacuated the system for most of the day before adding the R-134A. A/C conversion

Cost for my system was under $400. Depending on where your leak is, your conversion could be more, even a lot more, especially if the evaporator, condensor, and/or compressor are involved. Wherever the leak (preferably found with the dye method), the minimum that needs to be replaced during the conversion are the receiver - drier and the expansion valve, and the system should be evacuated for at least a couple of hours.

This is pretty much what i remember from my conversion. There are several good threads on the conversion in the archives as well. My experience with the r134 is that it seems to take a bit longer to get cold, but seems to chill just about as well as the R-12.

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

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