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Pelican Technical Article:

Blower Motor Replacement

Steve Vernon

Time:

5 hours5 hrs

Tab:

$110 to $325

Talent:

***

Tools:

Flathead and Philips screwdriver

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

New blower motor

Hot Tip:

Make sure the motor is level when reinstalling

Performance Gain:

Working HVAC

Complementary Modification:

Clean the ducts

The blower motor works to move air through the HVAC system. If the blower motor starts making noise when you turn the fan on there is a very good chance it is starting to go bad and will need to be replaced. If the motor is not turning at all the first thing you should do is check the fuses.

The blower motor on the W124 is not quick or easy to replace but if you follow the instructions here it can be done, and you can save yourself a lot of money.

You will need to remove the mono-post wiper and motor before you can remove the blower motor. Please see our article on mono-post wiper motor replacement for additional assistance.

When removing the wiper motor you will need to remove the foam section between the engine compartment and the cabin air filter box (red arrow).
Figure 1

When removing the wiper motor you will need to remove the foam section between the engine compartment and the cabin air filter box (red arrow).

There are four circular screw heads that look like flowers (red arrow).
Figure 2

There are four circular screw heads that look like flowers (red arrow). Unscrew these and carefully remove the piece. The foam and plastic can become very brittle over the years so work slowly and carefully. You will need to feed some of the wiring harness through the openings as you go. Then remove it from the engine compartment.

With the wiper and motor removed you will be looking at the cabin air filter box.
Figure 3

With the wiper and motor removed you will be looking at the cabin air filter box. Remove the evaporator sensor (red arrow) by pulling it out of its mount and setting it aside. Next remove the two air filters by folding down the clip on the lower left section of the box (yellow arrow). The other clips are fixed and if you try and force them they will break. Slide the bottom filter out first and then lower the top filter and slide it out like the other one.

The blower motor is contained inside the plastic air box.
Figure 4

The blower motor is contained inside the plastic air box. The lid to the air box is held in place by several small metal clips (red arrows).

Remove each clip by gently prying them away with a flathead screwdriver (red arrow).
Figure 5

Remove each clip by gently prying them away with a flathead screwdriver (red arrow). Double check to make sure you have all the clips including the ones inside the box. You do not need to remove any of the Philips head screws.

When all the clips are loose the top of the air box will lift off (red arrow).
Figure 6

When all the clips are loose the top of the air box will lift off (red arrow).

The blower motor has two electrical connections and both wires are color coded for ease of installation (red arrow).
Figure 7

The blower motor has two electrical connections and both wires are color coded for ease of installation (red arrow). Separate the wiring connections noting the wiring runs below the motor. The motor is held in place by a single metal clip. Use a screwdriver and unclip the bracket from the rear of the air box (green arrow).

The motor is now free to be removed from the air box (red arrow).
Figure 8

The motor is now free to be removed from the air box (red arrow). You can take the motor to your work bench and clean and lubricate it. If you are removing the squirrel cages you will probably need to use a puller to get them off the spindles. Installation is the reverse of removal.



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Comments and Suggestions:
ernie Comments: the blower don't work until the engine is all warmed up driving and you will hear clanking sound in the motor then it will come on
December 5, 2016
Phillip Comments: Thank you for the great instructions - before I go ahead - is there a way to find out if my car has the air filters? The one I used to have was an '89 200D and it did not have hte filters.
My car now is a '91 300D turbodiesel - I guess it would be a good thing to change the filters while I got that far?
September 23, 2016
  Followup from the Pelican Staff: Yes. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Bill Comments: Is this the same procedure for a 1998 SL500?
September 9, 2016
  Followup from the Pelican Staff: No.

Applicable Models:


Mercedes-Benz W124 (1986-95) - Nick at Pelican Parts
 
crowdedgarage Comments: Very good instructions. Depending on your circumstances, mileage and usage of car etc., you may want to try a serious
blast of Wurth penetrating lube on an old motor before trashing it. Did this to a bathroom squirrel-cage and it's been quiet as a sleeping mouse for two years now.
June 9, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Kevsta Comments: Hi, great post. I need to replace the blower unit in my 94 e320 wagon but have been told that the replacement needs to be from the same manufacturer i.e. bosch, hella etc as the current one. Is this so as they all have the same part no 124 820 06 08?

Thanks.
February 23, 2016
  Followup from the Pelican Staff: I've never heard that. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Rickster Comments: Just put in a new blower motor and it does not work. will not spin on low, auto, or high. checked all fuses with meter and they are good. any ideas what could be wrong.
Thank you
P.S. I love all the helpful info you people provide!
December 23, 2015
  Followup from the Pelican Staff: Does the blower motor have power and ground? What is missing? - Nick at Pelican Parts  
Dave Comments: Superb very helpful, will now tackle this job with more confidence than before. Squealing fan is like having a mouse behind the dashboard. Drives you mad.
November 16, 2015
  Followup from the Pelican Staff: Thanks for the feedback. We appreciate it.
- Nick at Pelican Parts
 
keith Comments: Do you carry this plastic piece or know the part number for the w124
November 4, 2015
  Followup from the Pelican Staff: Yes. I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 

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