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 07-10-2004, 10:51 PM
steif1
Guest
 
Posts: n/a
Compressor Fried Klima?

Hi,
The AC in my 86 16V suddenly stopped working. The compressor will not engage. I opened the Klima relay and found a burn mark on one of the copper strips on the PCB which connects pins 5 and 7 through the relay to provide power to the compressor clutch. I soldered a wire to by pass the burned strip and the compressor engaged for about 10 seconds and cut out again. I opened the Klima relay again and found the same problem. I did this twice with the same results. Can a faulty clutch burn up the Klima relay? The compressor turns freely when I turn it by hand.
Thanks!

Reply With Quote
  #2  
Old 07-10-2004, 10:55 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Sure can, got one in the shop at the moment on a 88 300TE.

The clutch coil should have 3-4 ohms of resistance and thus draw 3-4 amps. The one in quesion has less than 1 ohm and burns a 16amp fuse instantly with the Klima by-passed.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #3  
Old 07-11-2004, 11:19 AM
steif1
Guest
 
Posts: n/a
Thanks Steve. How do I measure coil resistance? There are three pins on the compressor (two are for the speed comparator circuit and one is for the 12V from the Klima relay( power in). I assume I should I take it between the compressor power in pin and ground with the engine off....is this correct?
Thanks again
Reply With Quote
  #4  
Old 07-11-2004, 11:37 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Yes.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #5  
Old 07-11-2004, 06:40 PM
steif1
Guest
 
Posts: n/a
Smile

Mine also measured less than 1 ohm (approx .5). Time to order a new compressor with clutch (or just the clutch).
Thanks again Steve!
Reply With Quote
  #6  
Old 07-11-2004, 07:01 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I'm replacing the clutch assembly with a MB rebuilt. List price is about 150. We will do it on the car as the TE has the rear hydraulic lines complicating compressor removal. Besides if we don't remove the compressor the system can be left alone.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #7  
Old 07-14-2004, 10:52 PM
steif1
Guest
 
Posts: n/a
Do you reccommend I replace the whole compressor/clutch assembly or just the clutch. The compressor has atleast 120,000 miles on it. How susceptible is my compressor to the "black death" caused by the teflon breaking down and contaminating the entire system? Am I over reacting...should I just replace the clutch and call it fixed or shall I go ahead and replace the compressor and drier as a preventive measure?
Reply With Quote
  #8  
Old 07-15-2004, 07:50 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The common use of such logic says that if the compressor clutch is bad maybe I should replace the whole car. With interest rates and rebates, it may be possible to drive a car and never pay for a repair.

I'm too old for such logic. Good compressors don't come with a clutch so there is no reason to replace what hasn't failed.

Black death is most common on rebuilt Nippondenso compressors. one of the worse things that can happen to a good AC is to replace the compressor with a POS rebuilt for such logic or cause it leaks and wind up installing a rebuilt can of black death disguised as a cheap rebuilt.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #9  
Old 07-15-2004, 11:14 PM
steif1
Guest
 
Posts: n/a
I agree...why replace a perfectly good compressor. Just bought my clutch from the dealer today. Funny how it's cheaper at the dealer (with my MB discount) than the local auto parts stores. I'll install it this weekend so I can swing by and return the core sometime next week. Thanks for the insight and all the help.

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 04:41 AM.


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