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E34 (1989 - 1995)

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  #1  
Old 08-06-2012, 02:47 PM
Bugsie Bugsie is offline
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Mein Auto: BMW E34 M50 2.5
A/C upgrade: change of R12 gas

Hi all.

My car is 1990 euro spec with A/C. The problem is that gas has ended and no cold air.

The other big problem is this gas is forbidden starting 2001. Is there any kit or how to change to put the legal gas (I believe R124).

Thank you so much and best regards
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  #2  
Old 08-06-2012, 03:18 PM
paperplane94 paperplane94 is offline
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Mein Auto: 1989 525i M20B25
http://www.bmwe34.net/E34main/Upgrade/Data/BMWAC.PDF
http://www.bmwe34.net/E34main/Upgrad...a_retrofit.pdf

You need to have the proper compressor in order to convert without replacing the compressor. The seals will not hold the smaller R-134a molecules. Check the partnumber on your compressor and see if it is an R-134a compatible compressor.

Report back.
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  #3  
Old 08-07-2012, 11:23 AM
Bugsie Bugsie is offline
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Hi all.

Thank you so much for the prompt reply. Have you worked on the A/C conmpressors to direct me to the part number location???

Thank you and best regards
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  #4  
Old 08-09-2012, 08:20 AM
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ross1 ross1 is offline
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I've successfully re-gassed many r12 systems with R134 and PAG oil using the original compressor and seals. R134 is a smaller molecule but the leakage issue is very nominal, perhaps a little more gas every couple of years. Tree huggers fire away.
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  #5  
Old 08-10-2012, 02:43 PM
Bugsie Bugsie is offline
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Hi all,

thanks for all your help. I'll start with the part number and then try to some R134.
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  #6  
Old 08-12-2012, 09:09 AM
MeanM50 MeanM50 is offline
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Quote:
Originally Posted by ross1 View Post
I've successfully re-gassed many r12 systems with R134 and PAG oil using the original compressor and seals. R134 is a smaller molecule but the leakage issue is very nominal, perhaps a little more gas every couple of years. Tree huggers fire away.
This. I filled the stock set up with R134 about 3-4 years ago...still works fine...if any leakage has occurred, I am sure it's not worth worrying about.
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  #7  
Old 08-12-2012, 03:17 PM
Bugsie Bugsie is offline
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Hi all.

Thanks again for the answer. I think I'll do that. Put 134 and live with the leaks. MeanM50, did you check the part number of the compressor or didn't bother al all??

Thanks again and best regards
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  #8  
Old 08-21-2012, 09:11 PM
paperplane94 paperplane94 is offline
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You can check the part number but all it will tell you is whether or not the seals in the compressor are r-134 compatible or not.

As mentioned, you can reload with r-134 even if the part number says its only r-12 compatible.


The partnumber is a green colored sticker on the side of the compressor. It is usually the number with the largest font.
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  #9  
Old 08-22-2012, 02:09 PM
Bugsie Bugsie is offline
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Hi all.

Copy all. I'll check the part number. But for cost purpose, I think I'll try to put the R134 anyway. Just have to find the valves.

Thanks again for all your help.

Cheers and best regards
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  #10  
Old 09-21-2012, 04:01 PM
Bugsie Bugsie is offline
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Hi all. Report on this.

I bought a proper valve and was able to put the new gas in it. And it works.

One minor thing is that I have cold air blowing in most of the vents except for the feet.

Found out that the AUTO buttons doesn't stay in. Well.

Best regards and thanks for the help
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