Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)

E34 (1989 - 1995)

Reply
 
Thread Tools Display Modes
  #1  
Old 07-02-2012, 06:16 PM
CJ74753 CJ74753 is offline
Officially Welcomed to the 'Fest
Location: High Point / Thomasville area of North Carolina
 
Join Date: Jun 2008
Posts: 186
Mein Auto: 91 BMW 525i
Question What needs to be replaced with the A/C when converting r-12 to r-134a

Well about a year ago my compressor clutch locked up, cocked sideways and wore the shaft of the compressor off at a angle making it trash. It appears the R-12 and oil has leaked out as there is oil on the compressor and the recirculate button won't work anymore. My question is what all do I need to replace? I know I need to replace the compressor, drier, service ports for R-134a, and perhaps a new pressure switch is what I've read. I'm not sure how I'm going to flush the lines out as when I did it with my Explorer I used my father in laws compressor to blow them out but he has since passed away so I have no access to a compressor.
Reply With Quote
Advertisement
  #2  
Old 07-02-2012, 06:53 PM
Radian's Avatar
Radian Radian is offline
Officially Welcomed to the 'Fest
Location: Tucson, AZ
 
Join Date: Aug 2010
Posts: 687
Mein Auto: '91 535i 5-spd
No need to convert R-134A. It's 2012, use Autofrost (R406A) instead.

see: http://www.cooltop.net/autofrost.html

Minor housekeeping items while the system is empty:

Drop the condenser and gently brush / vacuum off all the bugs and debris from the cores
Install a new receiver-drier
Install new seals on the expansion valve assembly
__________________
Good food, good people, good times.

Last edited by Radian; 07-03-2012 at 10:49 AM.
Reply With Quote
  #3  
Old 07-02-2012, 08:51 PM
paperplane94 paperplane94 is offline
Officially Welcomed to the 'Fest
Location: Los Angeles, CA
 
Join Date: Jan 2012
Posts: 933
Mein Auto: 1989 525i M20B25
Is that one of those R-12 drop-ins where if you actually have to use R-134a no shop will vacuum your system for you?
Reply With Quote
  #4  
Old 07-03-2012, 11:09 AM
Radian's Avatar
Radian Radian is offline
Officially Welcomed to the 'Fest
Location: Tucson, AZ
 
Join Date: Aug 2010
Posts: 687
Mein Auto: '91 535i 5-spd
Quote:
Originally Posted by paperplane94 View Post
Is that one of those R-12 drop-ins where if you actually have to use R-134a no shop will vacuum your system for you?
Probably...But if that's the case, then don't go to the shop to charge your system. Do it at home.
__________________
Good food, good people, good times.
Reply With Quote
  #5  
Old 07-03-2012, 11:44 AM
CJ74753 CJ74753 is offline
Officially Welcomed to the 'Fest
Location: High Point / Thomasville area of North Carolina
 
Join Date: Jun 2008
Posts: 186
Mein Auto: 91 BMW 525i
Anyone else ever used Autofrost here? What should be changed if using Autofrost? I know the drier has to be changed when the system is opened. What about pressure switches, expansion valves, orifice tubes and things of that nature.
Reply With Quote
  #6  
Old 07-03-2012, 01:02 PM
Radian's Avatar
Radian Radian is offline
Officially Welcomed to the 'Fest
Location: Tucson, AZ
 
Join Date: Aug 2010
Posts: 687
Mein Auto: '91 535i 5-spd
Nothing needs to be changed in order to make a system compatible with Autofrost because the situation is actually the reverse. R-406A was developed specifically to supersede R-12 as a direct substitute in order to save the myriad of refrigeration systems in use at the time. Automotive a/c systems aren't the only a/c systems that use R-12 or the like.

EPA required additions to an automotive system are the installation of "distinguishing" service valves and an updated vehicle placard.

Any difficulty surrounding R-406A is in actually finding a shop that knows what the stuff is. Most full service refrigerant specialist know of it. Searching by phone however, I've found that a lot of large-chain automotive a/c shops simply don't know of anything beyond R-134A. Expect to have to dig a little to find someone in your area to help you.

This replacement has been around for years, it's certainly not the new, but swapping refrigerants doesn't make as much money as needlessly changing out compressors and purging systems for ill-advised customers.
__________________
Good food, good people, good times.

Last edited by Radian; 07-03-2012 at 01:03 PM.
Reply With Quote
  #7  
Old 07-03-2012, 02:15 PM
CJ74753 CJ74753 is offline
Officially Welcomed to the 'Fest
Location: High Point / Thomasville area of North Carolina
 
Join Date: Jun 2008
Posts: 186
Mein Auto: 91 BMW 525i
Well the compressor has to be changed, which will open the system which in turn makes the drier have to be replaced if I'm not mistaken. So I just need to find me a nice compressor on ebay...this one http://www.ebay.com/itm/DENSO-471-11...3e03bb&vxp=mtr looks like its what I need at a fraction of what Pelican Parts even sells it.

Last edited by CJ74753; 07-03-2012 at 02:20 PM.
Reply With Quote
  #8  
Old 07-03-2012, 04:26 PM
93tillInfinity 93tillInfinity is offline
Registered User
Location: St. Louis, Mo
 
Join Date: May 2012
Posts: 97
Mein Auto: 93 525i
try partsgeek.com thats a good price
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 05:26 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms