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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-09-2000, 02:14 PM
roland
Guest
 
Posts: n/a
the aircon compressor tends to cut out even when the temp is not cold enough. could it be the relay at fault? where is the relay, and how does it determine when to come on/off? any other suggestions as to where i should begin looking? thanks!
Reply With Quote
  #2  
Old 07-09-2000, 03:10 PM
Euroman
Guest
 
Posts: n/a
The 123's have a mechanical evaporator temperatur control that is set to cycle the compressor off at about 48 degrees evaporator temperature. This is not very cool to most of us since most other cars use about 38 degrees for this cutout. Additionally there is a cacuum controlled solenoid that closes a door limiting outside air into the system. If this is bad then the system continues to try to cool down outside air versus recirculated air. Both of these can be modified or repaired for better performance, especially if you are in someplace like Texas, NM, AZ, OK, etc where the heat is oppressive.
Reply With Quote
  #3  
Old 07-09-2000, 06:13 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Compressor control is different for the different models. What year and what A/C? Late 240Ds have an electronic control within the temp wheel which reads a variable resistor.

All the other 123 A/Cs use a ETR switch (evaporator temp regulating) which has a capillary tube into the evap.
Reply With Quote
  #4  
Old 07-13-2000, 09:19 AM
roland
Guest
 
Posts: n/a
the car is a w123 200 M115 engine.
How do I get to the ETR switch (evaporator temp regulating)? Where is it?

where i'm from, the heat IS oppressive ...

thanks!
Reply With Quote
  #5  
Old 07-13-2000, 09:26 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Roland,

We still must identify your A/C system. Being in a entry level model I presume you have manual controls and not Climate control. If the car was made later than about 1981 then it won't have a ETR switch it will have an electronic control in the temp wheel - Do you have a temp wheel or a rotating knob?

If you have a ETR switch it is easily exposed by removing the lower panel passenger side and its roght on the face of the evap housing, covered with insulation.

------------------
Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
Reply With Quote
  #6  
Old 07-13-2000, 09:37 AM
roland
Guest
 
Posts: n/a
hi steve, i definitely do not have climate control and it's a temp knob that i have. so what should i look for now? thanks again!
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Erratic sluggish acceleration/rough idle bobirving Tech Help 5 11-15-2004 03:06 PM
W140 Aircon Woes mckean Featured Cars 0 05-02-2004 08:10 AM
1991 300SL Sides Aircon DONT give cool breeze spins23 SL Forum 0 07-30-2003 11:14 PM
confusion about aircon hocky1 Tech Help 1 05-05-2003 10:46 AM
erratic aircon clutch engagement roland Tech Help 4 11-09-2000 07:23 PM



All times are GMT -4. The time now is 04:55 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page