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I do know that fresh air/recirculation door will close then open on mine after I unlock the car and open the door. I hadnt even put the key in the ignition when it happened. I figure its the car going thru its function checks. I believe it also happened after replacing the battery, a minute or two after connecting the new battery it did a function check. I also hear noises from the front sam and I think noises from the throttle body.
Maybe it has something to do with the front door opening/closing? The more I read the more im amazed at how these things all work.
Theres a motor that moves that door open and closed. fresh air comes in from the front of the windshield down past the plastic trim, goes through the box above the battery then to the blower. To recirculate the air that door closes to the outside and air is then sucked in from the dash board.
Heres how the air flows, shown with the box above the battery removed.
Fresh air comes in at blue arrow above, recirculated air in red arrow.
You’re supposed to filter all incoming air , right? I wonder if the filter in the photo - pre 13 would fit on a facelift Glk . Now I’m sucking in everything. I have not done the interior filter myself but my friend who does mine did say the interior filter was a B
The pre and face lift filters are very different. Maybe you're actually questioning if the engine compartment opening on the post will accept the pre-face lift filter? Don't know.
Seems odd that with the pre-face lift the squirrel cage fan is getting filtered air. On the face lift the fan gets unfiltered air :-(
Would be nice if you could use both together on the post-face lift. Probably would be too restrictive, though.
I change mine every year and it never gets easier/simpler/faster/less painful. It sucks. It actually gets three times more difficult for every year you get older 😞
Well... looking at a couple of parts sources photos it seems the the pre-face lift and face lift GLK share the same cabin filter inside the cabin but the pre-face lift has two cabin filters?? One in the cabin and the one in the engine compartment??
Good find. Would not mind a pre-filter. Would help the internal filter stay cleaner (last longer) so it would not have to be changed so often. Also would be nice to maybe reduce crap build-up on the fan blades. Air flow capacity would be the question but maybe worth a try. I certainly like the non-Mercedes price...
2014 GLK350 base model (active) ; 2001 E320 base (retired); 2001 Wrangler soft-top
Originally Posted by TimC300
Heres how the air flows, shown with the box above the battery removed.
Holy cr@p ... our GLK does NOT have the filter your arrow is pointing to... so now I have to find that filter and buy it ... much appreciate that photo !!
2014 GLK350 base model (active) ; 2001 E320 base (retired); 2001 Wrangler soft-top
Okay folks ... I did a duplicate drive test that I did on Fri (or was it Sat?).
I drove without a/c to grocery store, then drove to Wally World after ... then on the return home, I flipped on the a/c ... so exact same scenario.
Parked in the garage.
Kept checking every 15 minutes ... at the one hour mark after shutdown, that fan fired up.
HOWEVER ... it did not run at full speed.
I recorded a video for comparison, to include touching my finger on the running fan. But I'll not post this followup video, unless everyone complains
I waited ... at the 30 minute mark after it started running, that fan shut down.
So yea, @TimC300 is SPOT ON with their response!!
Did you actually put this type of filter on your car?
Yes, I bought one of those filters Dec/2023 and its been in ever since. Reminds me I should probably order a new one and replace it. I do not notice any difference with it installed, which I think is a good thing. No change in air flow. I did check it a few months ago and it does seem to trap dirt.
@TimC300 is the model 204 man. We figured that out on the W204 C-Class forum. I don’t known where he finds the time, but if you have a model 204 (X or W) and can get his attention, he’s got the answer.
I'm pretty sure that filter is purely an aftermarket thing. I have yet to come across an actual Mercedes part# for the filter and have not come across it in any Mercedes drawings.
I wanted it after seeing how filthy it was inside the blower area. That opening technically leads right into the interior of the car. You can see the holes where the air flows to the blower from inside the car on recirculation mode. The area acts as a pass-thru for air for when the doors are closed to relieve the air pressure.
Thanks ... and yep -that's what I saw close for about 1-2 seconds, then it opened back up.
Certainly could be a test/check as TimC300 mentioned but that would be weird for it to be doing that check some minutes after you shut off the engine. At engine start up okay, right after engine shut off okay, although a bit odd, but minutes later?
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