300 SL Mercedes Air Conditioner Refill - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 07-02-2006, 07:33 PM Thread Starter
BenzWorld Newbie
Date registered: Jul 2006
Vehicle: 1991 Mercedes 300 SL - White
Location: Los Angeles. CA
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Send a message via MSN to pimplefaced Send a message via Yahoo to pimplefaced
(Thread Starter)
300 SL Mercedes Air Conditioner Refill

I havent the slightest idea of how to replace/refill the freon in my girlfriends 91 Mercedes 300SL. I bought a refill kit for $40 at autozone, but the picture and instructions in the book don't match the how to do if you REALLY dont know. Can any one refer me to a pdf or some website that will walk you step by step to refilling the air conditioner with freon? The can reads R-12 to R134a....Any help? you can email me at gabe@cuevas.com or send a link....thanks!

[IMG]<a href="http://photobucket.com" target="_blank"><img src="http://i7.photobucket.com/albums/y274/pimplefaced/karissacar.jpg" border="0" alt="Photobucket - Video and Image Hosting"></a>[/IMG]
pimplefaced is offline  
Sponsored Links
post #2 of 4 (permalink) Old 07-03-2006, 04:18 AM
CH4S Artist
Teutone's Avatar
Date registered: Sep 2004
Vehicle: 1985 500SEC, 1991 190E 2.6.
Location: Los Angeles / Hannover Germany
Posts: 33,442
Mentioned: 11 Post(s)
Quoted: 937 Post(s)
Lifetime Premium Member
I think you need to post on the car specific R 129 forum with more information. Is the system empty (has leak), or is it still cool and just low on coolant. Check out mbbraingears.com and the russian mb website for an online service manual. The search this forum function on the top right will get you to the links and all A/C threads in the archives. If you dont find it, go to the W 126 forum and the 'do it yourself' (DIY) thread for the links. I would stay away from general refill cans that are supposed to be used on R-12 systems without being R 12. The fittings on an R-12 system are different from R 134. I am reasonably handy with tools, but would not touch my A/C. The system is under vacuum/pressure and you can not mix R 12 with R 134. If it is empty, the leak has to be found and fixed. If the system does not get used periodically, the compressor seals will dry out and leak. In any case, after system opening, the dryer needs to be replaced, and the system evacuated with a good vacuum pump, to get everything incl. moisture out. If the system can hold a pre determined vacuum over a period of time, you have no leaks. I have an A/C expert do my stuff privately. Good luck.
Teutone is offline  
post #3 of 4 (permalink) Old 07-03-2006, 07:38 AM
BenzWorld Elite
Date registered: Jan 2004
Vehicle: 1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
Location: Ocean Isle Beach, NC
Posts: 3,467
Mentioned: 0 Post(s)
Quoted: 30 Post(s)
Heed the suggestions above. Do not add anything with any kind of stop leak. Do not add anything that doesn't match the type of freon you currently have in the system. If you don't know what you are doing, you can cost your girlfriend a LOT of money and maybe even a boyfriend.

sokoloff is offline  
post #4 of 4 (permalink) Old 07-03-2006, 07:44 PM
BenzWorld Member
Date registered: Jun 2005
Vehicle: 2005 E320 cdi
Posts: 180
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Take sokoloff's advise. If the 91 model is an R-12 system you can't put 134 in it without a conversion kit and even then there are sometimes problems with the old compressors picking up the 134 style oil. Take it to a reputable shop and have the system checked. Even with the price of R-12 being what it is-if the system is just low it's still cheaper than upgrading. There could be other problems with the system such as a bad compressor, compressor clutch, pressure switch or a hole in a line or the evaporator or condensor. If you screw it up it's going to cost you about half of what that 91 models worth to fix it!
Good Luck!
junkman is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode

    Posting Rules  
    You may post new threads
    You may 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 Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On


    Title goes here

    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome