Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 12-26-2001, 07:28 PM
Posts: n/a
Angry monvalue doesn't stop cold air

replaced the monovalue on 89 420sel, but still have cold air coming out of defrost at the same time warm air our of heater vent. what should i try next or shall i learn to live with it?
Reply With Quote
Old 12-26-2001, 07:38 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,243
Next step is to test every vacuum actuator and all of the vacuum system that is underneath the dash. Sounds like a vacuum problem now. Make sure you test the vacuum solenoid valves too. Tney are located behind the pushbutton unit on the 300D - not too sure on your model. When I was going through my 300D I found two of these in need of replacement.
Reply With Quote
Old 12-26-2001, 08:44 PM
Registered User
Join Date: Mar 2001
Location: Wyoming USA
Posts: 56

You might also check the pushbutton unit. I've replaced it in two of my 126 cars, along with monovalves. The last pushbutton unit checked out OK but it was the problem. I was not getting heat into the footboxes. Also, check the aux. water pump for function as it has an effect on the pushbutton unit.

Happy hunting.
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
COld air intake W201 190e crhenkel Performance Paddock 21 09-01-2007 06:18 PM
Mass Air Senson, '92SL c4791p Tech Help 7 10-17-2004 01:20 PM
Cold Air Intake System Turbo][ Performance Paddock 4 01-21-2004 05:02 PM
COLD AIR INTAKE the M103 300E FA22 Performance Paddock 10 04-12-2002 07:14 PM
Air Conditioning Not Blowing Cold Air Ammadeus Tech Help 3 07-28-1999 11:19 PM

All times are GMT -4. The time now is 04:19 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, 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