Heater Control Valve 78 450 SL - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 10-19-2010, 08:22 AM Thread Starter
BenzWorld Newbie
Date registered: Oct 2010
Vehicle: 1978 450 SL
Location: Ontario Canada
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Heater Control Valve 78 450 SL

I'm looking for a solution to fixing the heater control valve housing unit for my '78 450 sl that doesn't involve paying $1500 for a new unit. I've recently purchased the car and am a newbie when it comes to this type of car. Any suggestions?
hux is offline  
Sponsored Links
post #2 of 3 (permalink) Old 10-19-2010, 06:43 PM
BenzWorld Member
Date registered: Apr 2007
Vehicle: 1999 E320, 1975 450SEL, 1979 280SE
Location: PA
Posts: 369
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
If your car has the automatic climate control that was a Chrysler design, then your problem is common. A solution is to bypass the control housing with a seperate valve, controlled by installing a cable with a pull knob below the dash. I have this set up in my 1979 280SE (w116). It works well. It's inexpensive and fairly easy to install. When you want heat, you just pull the knob and the hot water flows through the heater core. The fan should work normally. The A/C works as usual. Basically, you would be converting the automatic system to a manual system. Hope this helps!
rabbit188 is offline  
post #3 of 3 (permalink) Old 10-19-2010, 10:01 PM
Administratoris Emeritus
GeeS's Avatar
Date registered: Aug 2002
Vehicle: 2021 SL770
Location: Fountain Hills, AZ
Posts: 44,831
Mentioned: 1 Post(s)
Quoted: 544 Post(s)
Mercedes R107 Climate Control Parts

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
GeeS is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode

    Similar Threads
    Topic Author Forum Replies Last Post
    Location of Heater Control Valve DerDeutsche W201 190-Class 4 07-20-2013 06:52 AM
    heater control dvo valve philip29 W140 S-Class 3 10-14-2009 03:39 PM
    Manual heater control valve erod84 W201 190-Class 0 03-30-2008 01:11 PM
    Wiper heater control valve Guest (MBNZ) W126 S,SE,SEC,SEL,SD,SDL Class 1 01-08-2002 02:37 AM
    Heater Control Valve Guest (MBNZ) W201 190-Class 1 05-30-2001 11:18 AM

    Posting Rules  
    You may post new threads
    You may 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


    Title goes here

    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome