W126 Fresh Air Intake - PeachParts Mercedes-Benz Forum

Theseus · #1 02-06-2022, 11:40 PM

Is this the fresh air intake? Was there ever a filter that went over it? I have heard that the cover at the bottom of the windshield was the filter, but the metal tabs look like it was designed to hold something.

How about the heat exchanger at the top, is that the evaporator or the heater?

87tdwagen · #2 02-07-2022, 10:26 AM

As far as I'm aware, this was never offered as an option on the W126. It is possible that the European EPC "might" have one listed but likely in the halls of unobtanium by now. There are some write ups on MB world regarding making your own, but in order to add a true cabin filter will require quite a bit of work to get a proper 30mm thickness filter to fit. On the other hand, you could easily fashion a workable assembly using a general household HVAC washable filter assembly. Home Depot and the like will have a cut to fit HVAC filter that comprises of various filter mesh media, and a couple of hard plastic grids to encase the media so that it stays put and not sucked into the evap. This can all be sized and trimmed to fit the space that you have. Now understand, that the CFM rate is quite high and the media cannot filter down to paper cabin filter levels, but it will do a great job of keeping lager debris from entering, and best of all, washable, so once you've made it, should last you as long as you need it to.

Theseus · #3 02-07-2022, 12:46 PM

Quote:

Originally Posted by 87tdwagen

As far as I'm aware, this was never offered as an option on the W126. It is possible that the European EPC "might" have one listed but likely in the halls of unobtanium by now. There are some write ups on MB world regarding making your own, but in order to add a true cabin filter will require quite a bit of work to get a proper 30mm thickness filter to fit. On the other hand, you could easily fashion a workable assembly using a general household HVAC washable filter assembly. Home Depot and the like will have a cut to fit HVAC filter that comprises of various filter mesh media, and a couple of hard plastic grids to encase the media so that it stays put and not sucked into the evap. This can all be sized and trimmed to fit the space that you have. Now understand, that the CFM rate is quite high and the media cannot filter down to paper cabin filter levels, but it will do a great job of keeping lager debris from entering, and best of all, washable, so once you've made it, should last you as long as you need it to.

I was thinking the same thing, using the washable window HVAC filters or a foam filter. It surely could be better than nothing and would be at least a filter for larger particles. Mercedes made some attempt on the Cowl cover, but it seems pointless being the fresh air intake can also come from the water drains. One could make the intake larger with some type of 3D printed cover that slips over it. I do know w126 has the luxury to have better access to the air intake than the W123 as the window wipers are not in the way.