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Re: 91 M5 (e34) air conditioning woes... (archive)
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Posted by Bigg Dawg on August 07, 2001 at 10:47:51:

In Reply to: Re: 91 M5 (e34) air conditioning woes... posted by Robert in Nashville on August 01, 2001 at 23:01:42:

Robert in Nashville, this is Biggdawg in L.A. I am having slightly different problems with my 91 M5, and I am replacing only the compressor, but it's not as easy as it sounds.
I now have to convert to r134 refrigerant and the part numbers for the factory rebuilt compressors don't seem to fit the M5 v.s. the 535's. Anyone else having this problem?

Robert is your compressor original? If so the next time your guy is under the hood, could you snag the Bosch part # for it? I know that it runs R-12, but BMW needs the original part # to find the right R134 conversion kit and my O.E. has been traded.

Another thought, I have had my 91 since 91 and i have only used a dealer myabe 4 times. A good independent with all the certifications is usually better and more loyal to you than the dealers. Get referrals from other owners with lon-time relationships.
They said the evaporator is leaking, as well as the expansion valve. They also said the dryer needs replacing due to age, and the condensor just because it appears to have leaked in the past , altough they could not get it to leak this time. Kind of makes me wonder if they really found a substantial leak. BTW, anyone ever heard of stop-leak for R12 systems? My Porsche mechanic told me about it today, said his BMW mechanic swears by the stuff and it works.

Anyway, I told the BMW dealer to hold off until I figure this out, so they left about 1.5-2 pounds of freon in it and now it is blowing cold as ice!! We'll see how long it lasts.

I'll try to update everyone on my adventures. Regardless of the a/c stuff, I love my new car and I have this board to thank for it!! I found it on here and flew up to buy it the next day. Thanks to you , too, Tony!! Now I'm going to kiss my 91 M5 and my 96 Porsche 993 cabriolet goodnight and put them to bed!! :-)


Everything except the compressor? Makes no sense to me. Its the moving parts that go bad. Compressor and expansion valve usually go first. What is wrong with the parts?





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