300 sel 6.5 heater motor - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 06-07-2005, 04:19 PM Thread Starter
BenzWorld Junior Member
Date registered: May 2005
Posts: 8
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
300 sel 6.5 heater motor

i just finished a shade tree restoration (actually just cleaning it up) of a 1971 300 sel 6.3 calif car no rust and under 100K documented(really).New head gasket because of exaust leak ,Xr700 ignition upgrade(runs great),over 75 hrs just changing hoses,belts,new carpet,detailing, wood refinishing etc etc. But.....yep...
The heater motor is out. I cleaned the switches, checked the fuse (ok). I read the shortcuts like drippling tranny fluid on a straw, cutting metal, etc. on getting a fix on other forums...i have no idea where it is even to do a shortcut!! Where is It??? Baby blue Manual is no help and ignores it...I do not want to spend the rumored two days pulling the dash and it is a summer car anyway. Any help will be greatly appreciated.
kiaserwil is offline  
Sponsored Links
post #2 of 4 (permalink) Old 06-08-2005, 09:54 AM
BenzWorld Member
Karl Heinze's Avatar
Date registered: Dec 2002
Location: Lawrenceville, GA
Posts: 68
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
RE: 300 sel 6.5 heater motor

The blower motor is located above the steering collumn. This is a real bear of a job and two days to do the job is quite reasonable. Having done this job before, I will say it is not for the feint of heart. I don't know of any easy access to it like there is on the w114/115 and w111/112 cars.


Mathieu J. Cama
Old World Automotive
Vintage Mercedes Repair and Mechanical Restoration
Serving the Mercedes community since 1986
Lawrenceville, GA

1961 Unimog 404S
1965 190c
1967 250s (for sale)
1970 280sl
1970 280se
1971 280se 5 speed
1978 280slc 4 speed
1982 280te
1982 300sd
1983 300sd
1983 240d 3.0 4 speed
1984 300d 5 speed (sold)
1985 500sel Euro w/ hydromat
1986 190e 2.3-16
1989 560sec AMG
Karl Heinze is offline  
post #3 of 4 (permalink) Old 06-08-2005, 04:35 PM Thread Starter
BenzWorld Junior Member
Date registered: May 2005
Posts: 8
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
RE: 300 sel 6.5 heater motor

thanks Karl...you confirmed my worst fears!!
kiaserwil is offline  
post #4 of 4 (permalink) Old 06-12-2005, 06:38 AM
BenzWorld Senior Member
Date registered: Jan 2005
Posts: 499
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
RE: 300 sel 6.5 heater motor

Is your car air conned?,you must remove the aircon if it is,a long job ,count on weeks if you want to remove the dash under side to get the heater out without damaging anything.
here is a basic out line on how to do the job.
1/ remove both front seats,
2/ remove the steering column,
3,remove the glove box,
4/ remove the aircon ,
5/ remove the radio,
6/ remove the speaker grille,
7/ pull the ends of the heater control knobs off.
8/with the glove box out,you should be able to see the aircon evaporator,remove the two hoses from under the hood and the undo the two brackets on top of the evaporator,pull the electrical plug off the evaporator and remove the evaporator.9/ remove the electrical plugs from the heater controls,there are three,one for lights ,one for heater motor control and one for fan control.remove the clips on the heater housing that hold the control cables in place.
10/reaching up through the radio slot ,there are two 9mm nuts on the heater control bezel,remove these and reaching down through the speaker grille hole you can remove the heater controls.
11/ Remove the two heater hoses under the hood from the rear of the engine.
12/on the heater box there are "sometimes" two brackets holding the heater to the firewall,these are fitted with 10mm nuts.remove these.
13/the heater housing should now be ready to remove.
shake it vigourously to loosen the gasket on the heater fan motor.
14,the gasket will rip so count on buying a new one,the heater will tilt over to the left side of the car to get it out,once it's out,flush the core,repair any leaks,replace any foam rubber door seals and replace the motor.
reassembly is a reverse of the above.[:)]
I find it easier to undo all the various clips and so on that secure the loom to the car,there is no need to worry which cables go where because all the plugs are different.
All 6.3's are different also ,so the above is only a rough guide.
mercmad 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:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

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

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