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

LinkBack Thread Tools Display Modes
Old 09-04-2005, 03:53 PM
Registered User
Join Date: Sep 2005
Posts: 3
86' 420sel climate - heater

I recently bought an 86 420 sel.

The heater does not work, unless the car has been completely turned off and started with the heater on. Then it only blows heat to the front. The back vent blows cold air. If the climate control temp is touched or any of the heater option buttons are touched then the heat stops, (and I get cold air.) The fan setting have no impact on any of the above.

To get the heat going again, I have to turn the car completely off and wait a few minutes befor starting again.

I have searched the forum and not found a problem exactly like mine. The closest I got was to rebuild the monovalve. Would this do it?

Also, if I need to get at the climate contols how do I pop the wood face off?

-D Rider

Reply With Quote
Old 09-04-2005, 04:44 PM
Senior Member
Join Date: Jul 2002
Location: visalia ca
Posts: 368
you can have numerous issues. bad fuses. if they are old just replace them all. use only ceramic copper fuses.
the heater mono valve is bad. the pushbutton control unit has cracked solder joints. the small hose from the dash temp sensor to the fan is bad. the fan is bad. try those first.


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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
1990 420SEL heater problems goertz Tech Help 2 05-30-2005 11:15 PM
420sel Heater Problem SCOTTFISH Tech Help 0 10-24-2004 12:53 PM
Heater Valve & Other Climate Components BrierS Tech Help 7 08-04-2004 09:47 AM
Climate Control in 420SEL flips from cold to hot William Tech Help 1 08-15-2003 06:17 AM
HELP! 420sel heater blower Dave Bunker Tech Help 1 10-19-2002 05:17 PM

All times are GMT -4. The time now is 07:02 PM.

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