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150 Posts
Discussion Starter #1
Well my Service E was overdue since I reset the reminder at 26,000 miles. I have been

procrastinating to getting this done, i'm actually glad I didn't do it earlier since the Air

Filter was only about 20% dirty, could have gone another 10,000 miles easy.

Nevertheless, I decided to do a write-up since there wasn't a good one yet...

Tools Needed, Torx Screwdriver T-20.
Supplies: Mann Air Combination Filter (purchased from

The instructions supplied (pictures only) with the filter are pretty good, but the following

ones should help even more..

Best way to have enough room to dive in there, is get the top down and open the passenger

door all the way.

Remove the three torx screws using your nifty torx-20 screwdriver.

Pull back the padding in the footwell like in the picture below:

There is tab holding the left part of the plastic piece, use a flat-head screwdriver to pop

it out.

Disconnect the light connector, and the cigarette lighter connection (this is a weird pull

down clip type plug, took some futzing to get it out)

Once the plastic piece is out, you will see a large white box, the filter is inside this

box. There are two yellow clips that need to be slided to the left/right. The box then pops

out from below and the folded-filter will fall right out.

Pic of the old filter, as you can see its pretty clean after 30,000 miles:

Make sure you remember the way the filter was (directionally).

That's the base of the filter box, take some time to clean it as well since you have access

it to it right now...

Once you put the new filter in and put the under-part of the white box back on, you have to

be very careful to make sure it fits snugly. I read in other member's posts that they had to

remove and replace 2-3 times to ensure a snug fit with no air leaks. I had the exact same

thing happen to me!! You have to turn the A/C on, and then check for leaks with your hand

placed at several sides of the box.

Look at the diagram below to see the points to check.

Step12: Thats it, once you make sure the lower box is snugly fit, you're done!

Total Time : 1 hour , Supplies Cost: $50.00

2009 SLK 350
54 Posts
Excellant, thanks for the pics and write up! Checking for air leaks after the install is critical as the HVAC system won't function correctly if you have a leak.
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