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 02-01-2000, 11:33 AM
Nick Kotterman
Guest
 
Posts: n/a
My '86 420SEL only blows warm air out of ALL the vents, even when the temp wheel is turned down. In that case, the center vents open up and hot air pours out of them. The system picks the right settings, it just won't blow cold air. It warms up the interior till it is uncomfortably hot, and then opens the center vents to (i assume) cool it back down, but only hot air blows out of them. I have resorted to pushing the min. fan setting, and then turning off the system when it gets too hot. I am just thankful it is only 35 degrees out, or else I don't know what I would do. Any suggestions?? Thanks for the help.


Nick

Reply With Quote
  #2  
Old 02-01-2000, 12:17 PM
LarryBible
Guest
 
Posts: n/a
The clmate control unit in the dash applies a voltage to the servo valve which controls the flow of hot coolant through the heater core. The servo valve is a normally open valve. This means that if no voltage is applied fromt the control unit, it flows maximum hot coolant through the heater core causing hot air being blown under any conditions.

If you check for voltage at the connector to the servo valve under the hood, I'll bet you will find that no voltage is present under any condition. If this is indeed the case, the problem is most likely in the climate control unit. If there is voltage there, check the valve.

The control units are a few hundred dollars exchange and come with a chart which gives you the pinouts for checking the sensors and actuators which it controls using an ohmmeter. I'm sure that the mercedes shop, the people who host this site, can provide the control unit or the valve, whichever you need.

Good Luck,
Larry Bible
Reply With Quote
  #3  
Old 02-01-2000, 06:22 PM
Senior Member
 
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
Replace the mono valve ins here is part number 000 835 06 44,just remove four screws at top of mono vlave,valve is locate right next to battery under hood. good luck.

------------------
MB STARS Master Guild Technician,12 years MB tech
6 years independent shop owner

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
1986 420 SEL Climate Control MarkPavelka Tech Help 3 11-08-2004 09:45 PM
380SL climate control problem mike380 Tech Help 2 04-14-2003 01:33 AM
Climate Control awfrance Tech Help 3 03-04-2003 09:10 AM
Belt Squeal - Climate Control jcd Diesel Discussion 12 01-09-2002 02:53 AM
300D Climate Control Schematic jerryk Tech Help 5 06-26-2000 04:37 PM



All times are GMT -4. The time now is 08:37 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, 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