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DIY cabin air filter for pre-facelift models

speedy300dturbo

E500E Guru
Member
Hi everyone,

One of the few shortcomings of the pre-facelift models is the lack of a cabin air filter. A French company "JR Filter" used to make an aftermarket snap-in filter, but those have been out of production for over ten years now.

The challenge is finding a suitable filter media that's flexible yet will stay in place when cut to fit over the fresh air intake grills. I found this Honeywell product which is technically a "pre-filter" material, but is still better than no filter at all. I folded it over twice, cut it to size with some trial and error, and left some extra material at the top and inner edges so I could affix metal clips between the filter and plastic lip of the air intake surround. The metal clip is MB part number 124-988-06-78.

So far there's no noticeable effect on blower airflow with the filter installed. When I replace it in a few months, I'll make a more precise fitting version. Here's what it looks like for now:

IMG_6559.jpgIMG_6560.jpgIMG_6561.jpg
 
So far I've been quite pleased with the effectiveness of this filter. Lately in California the air has been quite smoky to say the least, and I did not notice any smoke odor when running the AC throughout the past week. Visually, the filter media has also trapped quite a bit of grey ash, which is nasty stuff that you want to keep out of your HVAC ducts.

I highly recommend that all pre-facelift W124 owners do this!
 
I just spent an hour tearing the whole assembly apart on my Euro '91, just to find out that I have no cabin filter inside. At least I cleaned everything on the way nicely.
 

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