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Mercedes Air Filter Replacement
 
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Pelican Technical Article:

Mercedes Air Filter Replacement

Steve Vernon

Time:

30 min

Tab:

$20

Talent:

*

Tools:

T25 Torx driver, rags

Applicable Models:

Mercedes-Benz ML320 (1998-03)
Mercedes-Benz W203 (2001-07)

Parts Required:

New air filters

Hot Tip:

Wipe down the inside of the airbox

Performance Gain:

If the old filter is really dirty, you'll pick up some power

Complementary Modification:

Change cabin air filter

Every 10,000 miles or so, you should change the two engine air filters in your Mercedes-Benz C320. The air filters protect the air intake system, valves, pistons, cylinder walls, and engine oil from dust and debris that can be sucked in under normal operation. Replacement is a snap and should take only take 30 minutes or so.

Begin by opening the hood and having a look at the engine. There are two air filters on the C320, one on each side of the engine that feed air from the two air inlet ducts on each side.

You will need to remove the two air inlet ducts as well as the front engine cover to get access to the air filter housing on top of the engine.

Remove each duct by compressing them towards the engine and slipping them off the air inlet.

With the ducts off remove the front engine cover. It pulls up and away from the engine. The cover is held on by five clips and will easily come off with hand pressure.

Next you will need to remove the main engine cover that also houses the air filters. It is held on by four pressure clips. You can see the two at the front of the engine, to remove the housing lift it at the front of the engine and once the front clips release the rears (which you can not see) will release as well.

Place the housing on a flat surface with the logo side facing down. The air boxes are held on by four T25 screws on each side. To remove the air box loosen the four screws on each side. While the screws will fully loosen they will stay attached to the airbox.

Flip the airbox over and remove the filter. The filters will only fit into the box in one direction so take note which way they came out. Clean any dirt or debris in the box and insert your new filters.

Installation is the reverse of removal.

You will need to remove the two air inlet ducts (red arrows) as well as the front engine cover (yellow arrow) to get access to the air filter housing on top of the engine.
Figure 1

You will need to remove the two air inlet ducts (red arrows) as well as the front engine cover (yellow arrow) to get access to the air filter housing on top of the engine.

Remove each duct by compressing them towards the engine (red arrow) and slipping them off the air inlet.
Figure 2

Remove each duct by compressing them towards the engine (red arrow) and slipping them off the air inlet.

With the ducts off remove the front engine cover.
Figure 3

With the ducts off remove the front engine cover. It pulls up and away from the engine (yellow arrow).

The cover is held on by five clips (red arrows) and will easily come off with hand pressure.
Figure 4

The cover is held on by five clips (red arrows) and will easily come off with hand pressure.

Next you will need to remove the main engine cover that also houses the air filters.
Figure 5

Next you will need to remove the main engine cover that also houses the air filters. It is held on by four pressure clips. You can see the two at the front of the engine (red arrows).

To remove the housing lift it at the front of the engine and once the front clips release the rears (which you can not see) will release as well (red arrows).
Figure 6

To remove the housing lift it at the front of the engine and once the front clips release the rears (which you can not see) will release as well (red arrows).

Place the housing on a flat surface with the logo side facing down.
Figure 7

Place the housing on a flat surface with the logo side facing down. The air boxes are held on by four T25 screws on each side (red arrows).

To remove the air box loosen the four screws on each side.
Figure 8

To remove the air box loosen the four screws on each side. While the screws will fully loosen they will stay attached to the airbox.

Flip the airbox over and remove the filter.
Figure 9

Flip the airbox over and remove the filter. The filters will only fit into the box in one direction so take note which way they came out. Clean any dirt or debris in the box and insert your new filters.

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Comments and Suggestions:
dave Comments: battery voltage 12.25 volts.start the car and it drops to 12.00. turn on an accessory such as a.c. and it drops to 11.5. car some times will not crank at all. when this occurs the engine cooling fan runs when the key is in the on position
April 23, 2016
  Followup from the Pelican Staff: Sounds like a faulty alternator.

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
 
drdave Comments: got a 2001 c320 with alternator/battery warning. replaced both and still got the issue. is this a problem with the front sam module?
April 22, 2016
  Followup from the Pelican Staff: What is charging system voltage and current, loaded and no load? - Nick at Pelican Parts  
Todd Comments: Hi. Thanks for the article. I just replaced mine, which was identical to this description despite the fact that I have a 2005 CLK 320, outside the range of the applicable models you specify.
October 23, 2014
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
SAPguru Comments: Thanks for sharing this important maintenance information Pelican Team!!!! Now I can change my filters to the K&N reusable filters in my 2005 E320.
September 25, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Mac Comments: I've noticed that there aren't a lot of instructions for how to perform a lot of the maintenance on a 2003 C230. I'm just wondering if this information applies to that particular model or no? Because I don't see the 2003 C230 listed above as an applicable model on hardly any of your posts.
April 4, 2014
  Followup from the Pelican Staff: This tech article applies to:

C320 (1998-2004)
E320 (1998-2004)
S320 (1998-2005)
ML320 (1998-2003)
CLK320 (1998-2004)
SLK320 (1998-2003) - Nick at Pelican Parts
 
Jared Comments: Thanks! This made installation a breeze and literally only took a few mins to remove and reinstall the filter cover. Most of the time spent was for unscrewing and cleaning the dust out.
February 5, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Clint Comments: Now if you could tell me what that resivoir with
The filter in it is. It's just above and to the left
If the power steering resivoir on my 2003 c320
February 2, 2014
  Followup from the Pelican Staff: I'd hate to guess, can you share a photo of it? - Nick at Pelican Parts  
Clint Comments: Thank you!!!
February 1, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Mark c Comments: We'll written, excellent photos. Made the job a snap!
December 23, 2013
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Rommel Comments: Thank you for this awesome article! The pictures were especially helpful with my first time changing the air filters on my 2005 E320.
August 21, 2013
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help. - Nick at Pelican Parts  

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