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 03-19-2007, 09:31 PM
Registered User
 
Join Date: Mar 2007
Posts: 3
1990 300E (124) A/C Help

Hi All,

I recently bought a 90 300E and wanted to convert from R12 to 134a freon. I've done it on my 86 300E and love it.

I took it to the shop that did the conversion on my older 300E, they flushed the system and fixed a connection leak between the a/c line and the compressor. After changing the compressor oil they filled the system with the new 134a freon. Compressor started right up and the vents began blowing cold air, but after 2-3 minutes the compressor shut off and wont turn on again. The shop says everything was well, compressor sounded normal the air was blowing cold, then suddenly the compressor shut off. The shop believes its an electrical issue and wants a electrical technician to trouble shoot the problem.

The shop said the pressure on both low/high sides were within normal range.

Can anyone help? is there a fuse? Any suggestions?

Thanks
GP

Reply With Quote
  #2  
Old 03-20-2007, 07:40 AM
LarryBible
Guest
 
Posts: n/a
Are you saying that you did a conversion on an a/c system that was working okay?

I am not a proponent of converting 12 systems to 134a in general, but especially not a 124 car. It just doesn't have enough condensor capacity to be a good candidate. With the price R12 coming down and the price of R134a going up I just don't see the need of the conversion anyway.

All that said, you need to start your troubleshooting procedure at the clutch connection with a voltmeter to see if it is getting actuation voltage. If it is, ohm the clutch to see that the coil still has continuity.

If there is no voltage at the clutch connector, trace the circuit backwards through the r/d pressure switch. While testing all this, keep in mind that the climate control does not pull in the compressor for a few seconds after starting the engine to make sure that there is engine oil pressure before loading the engine with the compressor load.
Reply With Quote
  #3  
Old 03-20-2007, 10:24 AM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
does your car have the mas relay over by the battery or a n a/c relay about the same size as the fuel pump relay?
__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
Reply With Quote
  #4  
Old 03-20-2007, 04:32 PM
tobybul's Avatar
Registered User
 
Join Date: Sep 2005
Location: West Michigan
Posts: 2,081
Since the summers in Michigan arent that long, 134a works fine here. I converted my 300D last summer. Since I knew the compressor was in working order and the system kept its charge, all I did was get the conversion kit (got mine from napa) from just about any parts store. Just follow the instructions.

It would be good to have a decent set of ac gages instead of the one that comes with the kit but it'll work fine.

Mine works great .

I decided against continuing with r12 cuz they seem to be difficult to get a hold of while walmart carries 134
__________________
the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth...
2007 Honda Accord EX
2007 Honda Accord SE V6
96 C220
97 Explorer - Found Another Home
2000 Honda Accord V6 - Found Another Home
85 300D - Found Another Home
84 300D - Found Another Home
80 300TD - Found Another Home
Previous cars:
96 Caravan
87 Camry
84 Cressida
82 Vanagon
80 Fiesta
78 Nova
Ford Cortina
Opel Kadet
68 Kombi
Contessa
Reply With Quote
  #5  
Old 10-27-2008, 08:03 AM
Registered User
 
Join Date: Oct 2008
Posts: 1
I also have a 1990 300E that needs the conversion kit. Can you tell me what parts come in the kit. Your post does not mention any new parts as part of the kit. I live in New York City and was quoted a price of about $400.00 parts and labor. Mercedes dealers would charge about $700.00. Can you reccommend a major auto chain that can do a compentent job?
I found your post by doing a Google search.

Thank you,

kwelleri
Reply With Quote
  #6  
Old 10-27-2008, 09:04 AM
E150GT's Avatar
I'm a chicken
 
Join Date: Sep 2006
Location: SAN ANTONIO, TEXAS
Posts: 1,148
You can buy a kit as cheap as 20 bucks that has the refrigerant and oil as well as the adaptors. I wouldnt use it though. If I was gonna convert, which I would not, I would have a reputable shop do it the right way and just pay the good money to do so. It would be worth the extra cash.
__________________
1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual
Reply With Quote
  #7  
Old 10-27-2008, 05:14 PM
tobybul's Avatar
Registered User
 
Join Date: Sep 2005
Location: West Michigan
Posts: 2,081
I would suggest evacuating the old refrigerant first b4 converting by pulling vacuum then charging while it is in a vacuum.

I used a vacuum pump.

__________________
the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth...
2007 Honda Accord EX
2007 Honda Accord SE V6
96 C220
97 Explorer - Found Another Home
2000 Honda Accord V6 - Found Another Home
85 300D - Found Another Home
84 300D - Found Another Home
80 300TD - Found Another Home
Previous cars:
96 Caravan
87 Camry
84 Cressida
82 Vanagon
80 Fiesta
78 Nova
Ford Cortina
Opel Kadet
68 Kombi
Contessa
Reply With Quote
Reply

Bookmarks


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 09:50 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page