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 09-29-2003, 05:59 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,744
W126 87 300SDL - ACC unexpected bi-level

When I set the ACC to cool after a hot restart, the side vents give cool air from the main register and hot air from the top register and windshield vents. Eventually the hot air gets cooler to the point of being proper AC. Theories:

- the heater core heat soaks while the engine is off and the monovalve is open

- the monovalve is taking its sweet time closing

- the R134a conversion in unable to quickly overcome residual heat in the heater core

This isn't a problem in the S420 or SE (SD AC doesn't work) or I don't notice it.

I replaced the monovalve cartridge yesterday. The old one looks as good as the new one. No change. I haven't checked the monovalve ground signal but I don't know what to expect.

Any ideas?

Thanks,
Sixto
95 S420
91 300SE
87 300SDL
83 300SD

Last edited by sixto; 09-29-2003 at 06:54 PM.
Reply With Quote
  #2  
Old 09-29-2003, 06:44 PM
Registered User
 
Join Date: Mar 2003
Location: franklin,mass
Posts: 211
Sixto, now that my 300sd heater is working, thanks to you, I have noticed the same thing. I thought it was something to do with the instant on wind screen defrost. Mine will fog the screen momentarely, then clear right away. What I have started to do is turn off ac before I shut down engine. This seems to help, I think, I was begining to think it was the nature of the system. steve
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 10:27 PM.


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