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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-16-2008, 11:50 AM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,325
r12 -> r134, what about getting r134 rated compressor?

I understand that the biggest problem with r12->r134 conversion is the r12 compressors just dont kick out the compression needed for r134 to be cool. is this accurate? Is it possible to use a newer compressor?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
Reply With Quote
  #2  
Old 06-16-2008, 11:52 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,174
no, not accurate.
the problem is that the system. I.E. the condenser/evaporator/compressor package does not have the capacity to handle the pressures and heat output of 134 in the R12 package.
a LARGER condenser or a paralell flow style would help dissipate the heat and keep the pressures down to allow the compressor to handle the charge.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #3  
Old 06-16-2008, 11:59 AM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,325
Ah ok. What years did MB start using r134?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
Reply With Quote
  #4  
Old 06-19-2008, 02:56 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,325
Anyone? I would liek to see if I can find a parallel condensor that is a bolt in or near it.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
Reply With Quote
  #5  
Old 06-19-2008, 03:41 PM
dieseldiehard's Avatar
Dieseldiehard
 
Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,115
Quote:
Originally Posted by winmutt View Post
Ah ok. What years did MB start using r134?
AFAIK The 123 never had 134A in the from the factory. the 124 chassis started using 134A around 1989.
If converting to 134 you should have the compressor flushed and to get the oil out of it it needs to be benched therefore remove compressor, flush it, replace. Flush system including removing the expansion valve, replace dryer, evacuate system and inspect leakdown rate, if OK then introduce proper PAG oil and R134A and it should blow cold but not as cold as R12.
If you find a suitable parallel flow condensor it will blow nearly as cold and should be acceptable in all except some really hot places. The only thing about the parallel flow codns is that they need a small adapter hose between their ports and the existing lines, they are different sizes. Or you can have new lines fitted (it takes a shop that is willing to improvise).
__________________
'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
Reply With Quote
  #6  
Old 06-19-2008, 03:54 PM
Registered User
 
Join Date: Oct 2005
Posts: 4,263
Flush the compressor with new oil only, never any solvents. You'll never get all of the solvent purged out of it.

I'm not sure that you'll get all of the mineral oil out by flushing, but perhaps a small bit left in there won't hurt anything.
Reply With Quote
  #7  
Old 06-19-2008, 04:40 PM
Registered User
 
Join Date: Jun 2005
Location: Chicagoland
Posts: 1,243
I just updated the AC system on my W114 from R12 to R-134. I used a new Seltec compressor, an aluminum parallel flow condenser, new barrier hoses, and a new expansion valve.

ACkits.com has the compressor and condenser. If you are replacing a York compressor they also sell an adapter.

For new hoses, http://www.rayeveritt.com/ is very reasonable priced.

Here is the thread if you want to read the full story R-134a Conversion Success
Reply With Quote
  #8  
Old 06-19-2008, 04:52 PM
Registered User
 
Join Date: Sep 2007
Posts: 612
Here's what I went with. It's expensive, I think $1,800 for the complete kit. I am still installing it.
http://www.europeancoolerair.com/nonac01.htm
Tom
Reply With Quote
  #9  
Old 06-19-2008, 05:01 PM
ForcedInduction
Guest
 
Posts: n/a
$1800 would buy a LOT of R-12.
Reply With Quote
  #10  
Old 06-19-2008, 05:04 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,325
Quote:
Originally Posted by thorsen View Post
I just updated the AC system on my W114 from R12 to R-134. I used a new Seltec compressor, an aluminum parallel flow condenser, new barrier hoses, and a new expansion valve.

ACkits.com has the compressor and condenser. If you are replacing a York compressor they also sell an adapter.

For new hoses, http://www.rayeveritt.com/ is very reasonable priced.

Here is the thread if you want to read the full story R-134a Conversion Success
This seltec compressor is it made for r134 and a r4 replacement?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
Reply With Quote
  #11  
Old 06-19-2008, 06:07 PM
Craig
Guest
 
Posts: n/a
Quote:
Originally Posted by ForcedInduction View Post
$1800 would buy a LOT of R-12.
Exactly!
Reply With Quote
  #12  
Old 06-19-2008, 06:27 PM
Tymbrymi's Avatar
Klatta Klatta
 
Join Date: Jan 2004
Location: Olive Branch, MS
Posts: 616
Quote:
Originally Posted by winmutt View Post
This seltec compressor is it made for r134 and a r4 replacement?
I'm pretty sure it is to replace the ancient York style compressor. IIRC, it was used in the 70's.
__________________
John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k
Reply With Quote
  #13  
Old 06-19-2008, 06:29 PM
Tymbrymi's Avatar
Klatta Klatta
 
Join Date: Jan 2004
Location: Olive Branch, MS
Posts: 616
Quote:
Originally Posted by ForcedInduction View Post
$1800 would buy a LOT of R-12.
To be fair, it is a retrofit kit for a car that didn't come from the factory with A/C...
__________________
John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k
Reply With Quote
  #14  
Old 06-19-2008, 06:35 PM
Tymbrymi's Avatar
Klatta Klatta
 
Join Date: Jan 2004
Location: Olive Branch, MS
Posts: 616
Quote:
Originally Posted by winmutt View Post
Anyone? I would liek to see if I can find a parallel condensor that is a bolt in or near it.
My '92 2.5T has R134. It seems to use the same condenser as my '87 300TD (R12). It cools *very* well... especially for our hot and humid southern summers. One of the improvements over the '87 is the dual fan aux fans...

I lost the link to it, but if you search you can find threads where people have added parallel flow condensers to a W123. Some of them give all the parts/fittings/etc they needed to do the conversion. Of course, they all make it look easy
__________________
John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k
Reply With Quote
  #15  
Old 06-19-2008, 06:48 PM
Registered User
 
Join Date: Sep 2007
Posts: 612
Quote:
Originally Posted by Tymbrymi View Post
To be fair, it is a retrofit kit for a car that didn't come from the factory with A/C...
Mine came from the factory with A/C. Yes, it is expensive. If it works out, I'll be happy. Since the car is like 27 years old, the rest of the components needed replacing. So if you figure out the cost of a new or rebuilt compressor, and if rebuilt how long will it last. New condensor, new evaporator etc. Then it is about half that. Some of the hoses are like $250 or $350 each. Now if the performance claims of less HP needed to run the compressor are accurate (3-5 hp vs 12-15 hp), then it might be worth it to some extent. I wouldn't spend that kind of money, if mine was a rust bucket though.
Tom
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 06:51 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