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 07-20-2015, 09:06 AM
Registered User
 
Join Date: Jul 2015
Location: Central Florida
Posts: 120
r134a capacity for 1983 240D

From the looks of it I have the original condenser and a Delphi R4 compressor. The PO converted to R134a. The system has a leak on the compressor manifold and I have a replacement manifold I am getting ready to install.

What is the refrigerant capacity of the system? Should I charge by weight or pressures?
Reply With Quote
  #2  
Old 07-20-2015, 12:05 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,194
... in Florida? wow.

I'd start by removing the condenser, and making sure all the fins are totally straight, and chemically clean it extremely well... reverse flush it while you have it out.any black debris, and you need a compressor...

the R4 in the 123 is nearly useless above 88F... I'd say around 1.6 lbs R134...
__________________
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 07-20-2015, 12:26 PM
Registered User
 
Join Date: Jul 2015
Location: Central Florida
Posts: 120
Quote:
Originally Posted by vstech View Post
... in Florida? wow.

I'd start by removing the condenser, and making sure all the fins are totally straight, and chemically clean it extremely well... reverse flush it while you have it out.any black debris, and you need a compressor...

the R4 in the 123 is nearly useless above 88F... I'd say around 1.6 lbs R134...
Thank you for the information. I'm going to give it a shot and see how it does. Even though it's Florida the temperature in the summer when I drive my commute is in the high 80's so it might be acceptable.

Is the best performance to go back to R12 or a Santech Compressor and Parallel Condenser?
Reply With Quote
  #4  
Old 07-20-2015, 02:32 PM
engatwork's Avatar
busy
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,001
R12 with original style compressor/condenser. R134 with Sanden and p flow condenser.
__________________
Jim
Reply With Quote
  #5  
Old 07-20-2015, 02:36 PM
tyl604's Avatar
Registered User
 
Join Date: Feb 2008
Location: Atlanta, GA
Posts: 2,931
R12 just as it was designed by MB.
Reply With Quote
  #6  
Old 07-20-2015, 03:37 PM
funola's Avatar
Registered User
 
Join Date: May 2005
Location: NYC
Posts: 8,113
Quote:
Originally Posted by vstech View Post
... in Florida? wow.

I'd start by removing the condenser, and making sure all the fins are totally straight, and chemically clean it extremely well... reverse flush it while you have it out.any black debris, and you need a compressor...

the R4 in the 123 is nearly useless above 88F... I'd say around 1.6 lbs R134...
94F here currently. 85 300D R4 134A getting vent temps of 58 F. Is that useless? Feels nice and cool to me. This is with no viscous fan, just the aux fan.
__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
Reply With Quote
  #7  
Old 07-20-2015, 11:39 PM
funola's Avatar
Registered User
 
Join Date: May 2005
Location: NYC
Posts: 8,113
__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
Reply With Quote
  #8  
Old 07-20-2015, 11:54 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,194
Quote:
Originally Posted by funola View Post
94F here currently. 85 300D R4 134A getting vent temps of 58 F. Is that useless? Feels nice and cool to me. This is with no viscous fan, just the aux fan.
In 85, MB changed the condenser design to a more efficient design. You are luckier than the OP... His 83 will have the old large tube coil.
__________________
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
  #9  
Old 07-21-2015, 12:16 AM
funola's Avatar
Registered User
 
Join Date: May 2005
Location: NYC
Posts: 8,113
Quote:
Originally Posted by vstech View Post
In 85, MB changed the condenser design to a more efficient design. You are luckier than the OP... His 83 will have the old large tube coil.
My 83 300 D never had working AC. But I did compare it to the 85 when I had both side by side, and the condensers were identical, same number of tubes same size tubes.
__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
Reply With Quote
  #10  
Old 07-21-2015, 12:55 AM
w123fanman's Avatar
Registered User
 
Join Date: Jun 2011
Location: Georgia Tech, Atlanta, GA
Posts: 1,465
An R4 in 94 temps can't be that bad, or at least better than the York on my 77 240D auto running R134a. We're seeing 98 this week.
__________________
80 300SD 183K- Brother's
83 300D manual 100K chassis- Dad's
87 190D 320K
88 Yugo GVX 9K
90 300D 226K
90 Lexus LS400 189k- Brother's
91 F150 4.9 160K
93 190E 2.6 Sportline Limited Edition 230K-Mom's
93 190E 2.6 Sportline Limited Edition 91K-Mine
96 Mercury Grand Marquis LS 242K
03 Sprinter 2500 Passenger 220K
06 Mercury Grand Marquis LS 105K-Mom's
Parts cars:
77 240D Auto-RIP
79 300SD- RIP
80 300SD
83 240D-RIP
85 240D-RIP
91 190E 2.3- RIP
93 190E 2.6-RIP
Reply With Quote
  #11  
Old 07-21-2015, 06:17 AM
Registered User
 
Join Date: Jul 2015
Location: Central Florida
Posts: 120
Anyone want to put down some wagers? I should be getting the dryer tomorrow and have it installed Friday.
Reply With Quote
  #12  
Old 07-21-2015, 10:24 AM
Registered User
 
Join Date: Aug 2011
Location: Carolina
Posts: 1,301
Quote:
Originally Posted by w123fanman View Post
better than the York on my 77 240D auto running R134a
R134a in the old style with the york IS WORTHLESS. Any minor cooling effect will be canceled by the tremendous drag from the compressor.

R12 with the old style york does work quite well. I can do 40* vents in my '78 no sweat.
__________________
Current fleet
1992 300D "IceBerg"
1984 300D "Blues Mobile"

1978 300CD "El Toro" Gone on to be born again
Reply With Quote
  #13  
Old 07-21-2015, 10:48 AM
funola's Avatar
Registered User
 
Join Date: May 2005
Location: NYC
Posts: 8,113
Quote:
Originally Posted by trout007 View Post
Anyone want to put down some wagers? I should be getting the dryer tomorrow and have it installed Friday.
No wagers but just a WAG:

If the AC components are brand new up to spec, 40F at the vents 88 F ambient with R12. 45F with 134A

Since your car is over 30 years old, my WAG is: 55F at the vents 88 F ambient with R12. 60F with 134A
__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
Reply With Quote
  #14  
Old 07-21-2015, 02:36 PM
Registered User
 
Join Date: Jan 2001
Location: Alexandria, Virginia
Posts: 5,425
My 2 cents worth -

Back in 2006, my first diesel was a tired, rusty, '82 automatic 240D. It had a rebuilt R4 compressor of unknown age & condition, except it turned freely. But the condenser was broken open and had been that way for who knows how long. The car wasn't worth spending alot to fix the AC. So I installed a used replacement condenser and a new filter-drier, and one of those R134 conversion kits from WalMart. If I kept it parked in the shade, the AC actually worked OK. Parked in the sun, it took forever to cool down to barely tolerable.
Still, it was better than no AC. Cranking up the idle speed and shifting into N at stop-lights helped the AC cool better in traffic. Glad I didn't waste any precious R12 on this as it turned out to have a slow leak that needed to be topped-off after about 2 months! I charged it up and the AC was still working when I sold the car 8 years later.

I recently installed a rebuilt R4, new filter-drier and expansion-valve on a friends beater '84 300D. The car had the R134 conversion so that's what I used. The new expansion valve was identical to the original, but was marked 'R134'. So far this converted AC has performed better than the conversion in my first 240D.

In the past 9 years I've had a couple W123s with working R12 systems. Those definitely outperformed the R134 conversions.

Happy Motoring, Mark
__________________
DrDKW
Reply With Quote
  #15  
Old 07-21-2015, 08:14 PM
Registered User
 
Join Date: Jul 2015
Location: Central Florida
Posts: 120
One more question. Which oil should I use? Some quick Google says PAG 150.
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 02:16 AM.


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