Junior Member, warming up (<31 posts)
Join Date: Jun 2012
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R12 - R134a conversion - A/C compressor
So I am in the process of upgrading to an R134a A/C system on my '91, and my car has a Bosch compressor (PN 64 52 1 385 416) that needs to be replaced. It is one of a couple of compressor part numbers that are unfortunately not compatible with R134a. There are some other threads in this forum that do a good job archiving this. The attached image is the list of part numbers that will NOT work with R134a, taken from the BMW service bulletin about retrofitting R134a (from 1996!). Hopefully this can be of some help as well!
I am posting because I am trying to figure out where I could get a remanufactured Seiko/Seiki compressor (PN 64 52 8 363 550) for less than the dealer's quote of $750. Part of that quote involves a ~$100 bracket that "may or may not be necessary." This statement agrees with what I have found on these and other forums about Seiko/Bosch compressors and which engines they fit on with/without brackets. Bav Auto has a reman compressor for $800 but does not match the part number, and there is no mention of a bracket.
Apart from doing a junk yard search on car-part.com, does anyone have any positive experiences here? The labor for the conversion is already going to be pretty high, so if I can avoid any part cost markup, that would be a pretty big help. But at the same time, I want to do it right. I am thinking about the longevity of this fine hand-built beast, and don't want to half-*** anything. You just don't do that to an M5 :-)