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Pelican Technical Article:

Cabin Air Filter Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$25 to $35

Talent:

**

Tools:

Philips head screwdriver

Applicable Models:

Mercedes-Benz W124 (1990-95)

Parts Required:

New air filters

Hot Tip:

Wipe down the inside of the airbox

Performance Gain:

Breathing cleaner air

Complementary Modification:

Change engine air filter

Every 10,000 miles or so, you should change the cabin air filters in your Mercedes-Benz. The cabin air filters helps protect the air that you breathe inside the car so you should change it sooner if you live in a dusty climate or do a lot of driving on non paved roads.

There are two filters that make up the cabin air filters on the W124 and they are not the simplest filter to change but if you take your time and follow these steps you should be able to install new filters in an hour.

There are two cabin air filters in the W124.
Figure 1

There are two cabin air filters in the W124. They are both located under the plastic cowl and access to them is from the left side of the wiper motor (red arrow). There are a few things you will need to remove to change the filters.

Begin by peeling back the weather stripping at the base of the plastic cowl (red arrow).
Figure 2

Begin by peeling back the weather stripping at the base of the plastic cowl (red arrow). The weather stripping just pulls off the trim. Remove it until it is past the wiper.

Remove the windshield rubber gasket or trim piece.
Figure 3

Remove the windshield rubber gasket or trim piece. There is a wide rubber gasket that seals out the elements from getting under the windshield and into the vehicle. Grab an end by the A-pillar (red arrow) and peel the piece back towards the wiper motor. There are two channels the gasket sits in so when reinstalling make sure they are both seated to get the full protection from the gasket.

There is a small plastic grate under the wiper motor.
Figure 4

There is a small plastic grate under the wiper motor. Remove it by pulling it straight up (red arrow).

The plastic cowl is two pieces and held together by a plastic clip.
Figure 5

The plastic cowl is two pieces and held together by a plastic clip. Remove the clip by pulling it straight back and out from the cowl (red arrow).

You will need to remove the center piece by the firewall (red arrow) as well as remove the two cowl pieces (yellow and green arrows).
Figure 6

You will need to remove the center piece by the firewall (red arrow) as well as remove the two cowl pieces (yellow and green arrows).

Use a Philips head screwdriver and remove the two screws (red arrows, one shown).
Figure 7

Use a Philips head screwdriver and remove the two screws (red arrows, one shown). Then pull the trim piece out.

The end of the trim piece by the A-pillar has a drain spout (red arrow) that sits in a drain tube (yellow arrow).
Figure 8

The end of the trim piece by the A-pillar has a drain spout (red arrow) that sits in a drain tube (yellow arrow). Make sure the spout is in the tube when reinstalling or the water will not drain correctly.

Remove the rubber seal around the firewall.
Figure 9

Remove the rubber seal around the firewall. Then remove the center trim piece by unclipping it at the firewall (red arrow) and from the cowl (yellow arrow) on both sides.

Use a Philips head screwdriver and remove the four screws (red arrows).
Figure 10

Use a Philips head screwdriver and remove the four screws (red arrows).

Pull the plastic cowl piece (red arrow) out from around the wiper motor.
Figure 11

Pull the plastic cowl piece (red arrow) out from around the wiper motor.

You can now see the two cabin air filters.
Figure 12

You can now see the two cabin air filters. There are held in place by two clips. The lower clip (red arrow) folds down to slide the filter out. The upper clip (yellow arrow) is fixed in place. If you try and force it you will break it.

Fold the lower clip down and slide the bottom filter out (red arrow).
Figure 13

Fold the lower clip down and slide the bottom filter out (red arrow). The filters are joined together by a groove on the frame of the filter.

This photo illustrates two things; what might be the worlds' dirtiest cabin air filter (red arrow) and the groove (yellow arrow) that the filters sit in.
Figure 14

This photo illustrates two things; what might be the world's dirtiest cabin air filter (red arrow) and the groove (yellow arrow) that the filters sit in.

Slide the upper filter down and out through the space where the lower filter was removed from (red arrow).
Figure 15

Slide the upper filter down and out through the space where the lower filter was removed from (red arrow). Wipe out the air box. Installation of the new filters is the reverse of removal.



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Comments and Suggestions:
Earl.Allen Comments: I'm sorry but I did mention my exact model: "1993 300CE w/3.2L M104" was in the post. Here is the VIN: WDBEA52E8PB939662; can't get much more exact than that. Incidentally, I've heard from other sources that cabin air filters didn't show up till the 1994 model year. Oh, well at least now I know how to get at my blower fan.
August 19, 2016
  Followup from the Pelican Staff: Sorry about missing your model info. I only recalled the year and W124 when answering. My info does state your vehicle has one. if it doesn't it doesn't. You can try to call parts and see if they say the vehicle shows one. Maybe it was left out.
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
 
Earl.Allen Comments: On my 1993 300CE w/3.2L M104, I just removed and replaced everything mentioned in this article and more. The removal process was significantly different. I saw no cabin air filter nor a place to mount them. Do the 1993 W124 Coupe models have a cabin air filter?
August 17, 2016
  Followup from the Pelican Staff: You didn't mention your exact model. My info shows 300Ce models have one at the inlet of the HVAC housing. - Nick at Pelican Parts  
JonR Comments: Same as Boomop, this is incorrect for 1990 300ce 24v. What is the correct method for our cars? Please advise!
July 23, 2016
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Karla Comments: I want to know which cabin air filters to order for my 1989 300D - according to w124-zone there are 3: a dust filter for heating/ventilation, an active charcoal filter and a recirculating air filter. I'm pretty sure none of these have ever been replaced...
Thank you
Karla
http://w124-zone.com/downloads/MB%20CD/W124/Index/Groups/83ClimateControlSystem.htm
August 17, 2015
  Followup from the Pelican Staff: 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
 
norm Comments: how do I know if my 1989 300 c e has a cabin air filter ?
July 16, 2015
  Followup from the Pelican Staff: I don't believe it does.

Give our parts specialists a call at 1-888-280-7799 to be sure. - Nick at Pelican Parts
 
boomop Comments: This is not the correct procedure for my 1990 300ce 24v. No cabin filter there.
March 16, 2015
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it. I will have the article updated.
- Nick at Pelican Parts
 

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