Need help with fixing the 280's heater - Mercedes-Benz Forum

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 12-19-2010, 10:28 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Aug 2010
Vehicle: 1971 280SE
Location: Kansas City
Posts: 37
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Need help with fixing the 280's heater

Car is a 71 280se, 6 cyl. I have one broken heater control switch but if you use a key or screw driver you can still move it fine. When i mess with the knobs i can hear the fan FAINTLY turn on a humm. Seems like it should be way louder, and still no heat. Any ideas on where to start with this project? Any ideas or past experiences would be greatly appreciated!

Thanks!

-Brian
Blue shark is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 12-19-2010, 12:36 PM
BenzWorld Senior Member
 
ktmripper's Avatar
 
Date registered: Jun 2010
Posts: 430
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Did your fan used to work? check fuses, or maybe try to bypass the switch to check operation. You know I still got that parts car if you need.
ktmripper is offline  
post #3 of 8 (permalink) Old 12-19-2010, 03:02 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Aug 2010
Vehicle: 1971 280SE
Location: Kansas City
Posts: 37
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
The heat has never worked since i've owned the car.
Blue shark is offline  
post #4 of 8 (permalink) Old 12-19-2010, 10:19 PM
BenzWorld Junior Member
 
Date registered: Dec 2010
Posts: 5
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
on where to start with this project? Any ideas or past experiences would be greatly appreciated!
Ricky Doherty is offline  
post #5 of 8 (permalink) Old 12-20-2010, 12:35 AM
BenzWorld Elite
 
Grubeguy's Avatar
 
Date registered: Jan 2006
Vehicle: 73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
Location: DC Area
Posts: 2,111
Mentioned: 1 Post(s)
Quoted: 97 Post(s)
Send a message via MSN to Grubeguy Send a message via Yahoo to Grubeguy
The heater blower controller is the same slide thing that controls whether you get fresh air or inside air. At ABOUT midway, the blower comes on. If you decide to replace the rubber control knob, the parts are available. The job entails taking apart part of your dash though, including the radio, glove box and some of the facing wood. Not tough, but a pain in the ass.

As for no heat, I hate to ask the seemingly dumb question, but are the other controls in the right places? Do the other controls slide as they should? Has the car ever had heat?
Grubeguy is offline  
post #6 of 8 (permalink) Old 12-20-2010, 04:36 AM
BenzWorld Senior Member
 
ktmripper's Avatar
 
Date registered: Jun 2010
Posts: 430
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
What confuses me is that in your road trip post you said your a/c worked until the pump blew up in the dessert. That leads me to assume the fan did work at that time. Also make sure your heater core is not plugged off or bypassed, That would cause no heat.
ktmripper is offline  
post #7 of 8 (permalink) Old 12-20-2010, 04:50 AM
BenzWorld Senior Member
 
ktmripper's Avatar
 
Date registered: Jun 2010
Posts: 430
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
To get heat you need 3 things: Blower fan on, heater core flowing, heat valve open.
ktmripper is offline  
post #8 of 8 (permalink) Old 12-20-2010, 08:22 PM
BenzWorld Member
 
unimoged's Avatar
 
Date registered: Dec 2008
Vehicle: 2004 S500. 2000 CLK430 Cab, 1999 C43 AMG. 1999 S500. 1999 S320. 1977 230 4 spd, 1972 280SEL 4.5
Location: Charlotte NC
Posts: 185
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
The heater fan sits up in the dash under the windshield in the center. I bet leaves have gotten in there and the blower wheel is stopped, thus the hum. This situation has been known to cause a fire if left un-repaired because the motor will overheat, catching whatever is in there (leaves, pine needles) on fire.

Regarding the AC, it uses a separate blower fan.
unimoged is offline  
Sponsored Links
Advertisement
 
Reply

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

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in











  • 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
    Hot Frog Pre-heater(block heater) normalbloke Unimog 18 12-14-2010 12:54 AM
    Disable Heater 1980 450SL - Heater always on mrnathe R/C107 SL/SLC Class 60 12-11-2009 01:24 AM
    w220, Park Heater, webasto, auxiliary heater Ardjoakim W220 S-Class 0 07-11-2009 03:13 AM
    Lets talk tow hitches C-280's snoopdouggydoug General Mercedes-Benz 8 07-16-2007 04:24 PM
    Why no coolant recovery tank on 280's? Nutz 4 Benz W123 E,CE,D,CD,TD,TE Class 4 11-05-2006 02:32 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

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