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Pelican Technical Article:

Cabin Air Filter Replacement

Kerry Jonsson

Time:

30 minutes30 mins

Tab:

$25

Talent:

*

Tools:

#1 Phillips head screwdriver

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Cabin air filter

Hot Tip:

Have a shop vacuum on hand to clean out leaves

Performance Gain:

Reduce odors from contaminated cabin air filter

Complementary Modification:

Replace engine air filter

In order to keep passengers comfortable regardless of the weather the W129 chassis came with a sophisticated climate control system as an option. It also came with a manually controlled air conditioning system in the base package. Either system uses a cabin air filter for filtering out impurities in the air from the cowl area into the car. The original filter is an advanced charcoal activated filter that was capable of filtering out pollution from the air before it entered the cabin. Just as a charcoal canister absorbs the fuel vapors from your fuel tank, the charcoal in the cabin air filter traps pollutants from the atmosphere. Your car may have had a regular paper element dust particle filter put in as a replacement already. As with any filter, over time they can get clogged and saturated and reduce air flow as fresh air enters the cabin. Mercedes-Benz recommends you change the cabin air filter once a year or every 15,000 miles. In this tech article I will go over the steps to replace your cabin air filter.

ThisPicture illustrates the back of the engine compartment by the cowl area.
Figure 1

ThisPicture illustrates the back of the engine compartment by the cowl area. Remove the engine compartment seal (green arrows). Pull seal off at the right side, then continue to peel it off until it is removed.

Working at the cowl, remove the two Phillips head fasteners (green arrows).
Figure 2

Working at the cowl, remove the two Phillips head fasteners (green arrows).

Once the fasteners have been removed, lift the center cowl trim up to detach it from the body.
Figure 3

Once the fasteners have been removed, lift the center cowl trim up to detach it from the body. The throttle cable (green arrow) will remain in the cowl piece, just lay the cowl trim aside, leaving the throttle cable attached.

Unclip the three clips (green and yellow arrows) on the front of the cabin air filter housing by moving them in the direction of the blue arrow.
Figure 4

Unclip the three clips (green and yellow arrows) on the front of the cabin air filter housing by moving them in the direction of the blue arrow. In this photo, one clip on the left side of the car (green arrow) is already unclipped, and the other clips (yellow arrows) are still holding the housing together.

Loosen the two Phillips head screws (green arrows).
Figure 5

Loosen the two Phillips head screws (green arrows). The screws will stay with the cover when removing.

Lift the cabin microfilter housing cover up to remove it.
Figure 6

Lift the cabin microfilter housing cover up to remove it.

Lift the cabin air filter out of the bottom of the cabin air filter housing.
Figure 7

Lift the cabin air filter out of the bottom of the cabin air filter housing. Installation is the reverse of the removal procedures. Install the new cabin air filter in the bottom of the cabin air filter housing and install the upper cover. Tighten down the two fasteners and clip on the three clips. Fit the center cowl insert and tighten the two fasteners for it. Install the engine compartment seal and you are done.

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Comments and Suggestions:
john Comments: i haven't done it yet on my 03.i still have to figure out how to get all the stuff that's covering the engine off.thanx for the info.
August 18, 2016
  Followup from the Pelican Staff: Let us know how it works out. - Nick at Pelican Parts  
RJ Comments: Love it! Ever since Mercedes ceased/ceased properly supporting its customers by making available workshop manuals, simple projects, such as air filter changes, are restricted to the dealerships and other garages; a needless expense.
October 7, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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Page last updated: Fri 12/9/2016 02:28:33 AM