Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-11-2014, 01:32 PM
Knappy Drag Racer
 
Join Date: Jun 2008
Posts: 1,725
Refilling R12: Can up (for gas) or Down (for liquid)?

I've finally scored some R12! Got three 14 oz cans of the stuff!

I'm working on my older W124s (89 and my 92). If the 92 was a M119 car it would be a R134a car!

I've already done a search here and on another site which lead me to a thread which had a link to the factory manual: 83 Climate Control System

The problem is the manual still didn't answer my question! Simply put, as stated in my title, which way do I hold the can? Up for gas, or down for liquid? (Different cars have different requirements in this regard.)

I think I've already established where the low presure side is (high in the engine bay, closer to the firewall on the driver side).

Thanks to all who respond!

Regards,
Eric
__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.
Reply With Quote
  #2  
Old 08-11-2014, 05:26 PM
pwogaman's Avatar
Senior Member
 
Join Date: May 2003
Location: Northern, Virginia
Posts: 2,015
Always gas, never liquid. Liquid can screw up the compressor.
__________________
http://i284.photobucket.com/albums/l...aman/Fleet.jpg

Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
90 300TE 4Matic
90 300D 2.5 Turbo
92 300D 2.5 Turbo
92 300TE 4Matic
01 Saab 9-5 Wagon
Reply With Quote
  #3  
Old 08-12-2014, 12:35 PM
Registered User
 
Join Date: Jan 2012
Posts: 6,235
The only time you use liquid is compressor off, connected to high side and you are using a heated charging cylinder. This gets the bulk of things going and then change to gas charging from the low side.

Be sure there are no leaks before filling the system. Pulling a vacuum is a good quick test but not 100%. My 97 C280 held vac for a few days but would leak under pressure.

Dry compressed Nitrogen / CO2 works. If you don't have any try this. With compressor off, can upright for gas, fill through the low side port to some pressure around 50 PSI. Note the pressure and check in a few hours / days. Also make sure your charging set isn't leaking. It does not take much out of a can to attain test pressure on most systems.

The C280 had a corroded condenser ( the area directly behind the aux fan motors ) that would hold vac but leak the test charge in a few hours. Due to the location the leak was difficult to find with a sniffer so I ended up clamping off hoses to isolate components.

My Ranger will loose the test charge over a week or two so I'd expect it to hold a full charge over a summer. At some point it will get isolation tests / connection o ring changes but since it is mostly used for winter and global warming has taken effect, I'm in no big hurry.
Reply With Quote
  #4  
Old 08-13-2014, 04:21 AM
Knappy Drag Racer
 
Join Date: Jun 2008
Posts: 1,725
Thanks big time for the help guys.

I'm pretty sure that both car's systems are fine.

I haven't filled the 89's system in the over 9 years that I've owned it. It's just simply time.

The 92 has apparently also been unused for some time as well. I just found out that the "brand new" looking tires on this car are actually 14 years old!

Despite all this, both systems still have a little pressure left in them!

Do you guys agree that I have found the low pressure port?
__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.

Last edited by 400Eric; 08-13-2014 at 04:50 AM.
Reply With Quote
  #5  
Old 08-13-2014, 06:21 AM
Registered User
 
Join Date: Jan 2012
Posts: 6,235
I don't see a picture.

The low side will be between the evaporator outlet ( car interior ) and compressor inlet.

The high side will be between the condenser outlet ( front of radiator ) and evaporator expansion valve inlet.

Sometimes the high side will be between compressor outlet and condenser inlet.
Reply With Quote
  #6  
Old 08-13-2014, 08:05 AM
Knappy Drag Racer
 
Join Date: Jun 2008
Posts: 1,725
I was editing my post to provide a description of where I think the low pressure port is when the site went down for maintainence. (It's also in my first post.) I think it's high in the engine bay, closer to the firewall on the driver's side.

The only other port I can find is low in the engine bay, towards the front, also on the driver's side. Sorry, no picture.
__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.
Reply With Quote
  #7  
Old 08-13-2014, 08:56 AM
Registered User
 
Join Date: Apr 2002
Location: Dallas Area
Posts: 392
The port that is low in the engine bay in front of the compressor is the high pressure port and the one that is closer to the shock tower (also on the driver side) is the low pressure port.
__________________
1986 300E (3/2002) Rear ended and totaled (10/2009)
2000 Xterra (5/2000)
1992 400E (11/2009) -Sold
1986 300E (12/2009)
2004 E500 Wagon (6/2013)
Reply With Quote
  #8  
Old 08-13-2014, 09:51 AM
Knappy Drag Racer
 
Join Date: Jun 2008
Posts: 1,725
Thanks guys.

Regards,
Eric
__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.
Reply With Quote
Reply

Bookmarks

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
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 08:05 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page