Cabin air intake.

[betyouaint]

Yep... had this whole mess in there the other day. Lovely smell too! Had the same issue with my Toyota Sienna where the critter had also dragged a plastic bag in there reducing my AC airflow to practically zero!

 

Edited July 13, 2021 by betyouaint

[MikeBMW]

In Florida, we always have a spring when the oaks, and other trees, produce enough pollen to turn every vehicle a yellow hue.
When it's about done, I always change out the cabin air filter for a new freshness that can only be described as a breath of fresh air.

[Spikes]

I changed mine the other day. Only thing I had in there was a bunch of nuts, but I made the mistake of not using a manila folder so a leaf fell down. Tore my hand apart trying to fish it out but finally got it and installed the new filter.

[jbugj]

I found where the mice got into mine and this was my fix.  Haven't had a mouse in the cabin filter since.

 

 

[M F]

Definitely had a one or many a mouse in my new truck (2018).  Hope they didn’t get any further anywhere with what they chewed off of the filter. The bottom left hand corner was in the back left hand side. I was searching for a diagram that showed intake to the filter and where/how it flowed from the filter box when I found this thread.

Last truck (2006) they got under my hood and chewed a wire harness somewhere. Kept blowing fuse. Byers Chevrolet in Columbus could never find the issue. I just lived with not being able to use passenger side windows for a very long time. 

[GovtMule66]

On 12/4/2016 at 10:08 AM, SwampCatRuss said:

UPDATE: Just last week I was cleaning out the last of the falling leaf debris, getting ready for winter, when I noticed a squareish rubber plug with 2 nipples on it, laying loose by the fender and the battery. Not having any idea where this thing came from, got me to looking. Turns out both ends of the firewall, up top by the black windshield wiper trough have these flapper type vents, like the type in the back of cab. The passenger side fell out, thats what was laying by the fender. With a mechanic mirror and a light could see where this thing goes. Reason it FELL off is, holes are too big, or nipples are too small,or both. Was fun trying to get these nipples back in the holes blind. ONLY TO HAVE IT FALL RIGHT BACK OUT. Some silicone adhesive fixed that. Now with that rubber plug out, the whole mouse family could dance the jig as they went through there. I KNEW there had to be a way people were getting those mulch piles on top of their cabin air filters. I found mine, yous may vary.

Thank you SwampCatRuss

 

I know this post & topic is several years old but I appreciate you taking the time to try helping others.  Today I was trying to help my Dad work on his 2015 GMC Denali when we were shocked by the amount of leaves, pine needles & twigs that had been sucked into the cabin air filter.  After reading your post I checked behind the battery and sure enough this rubber plug you described was just laying there.  Tomorrow we will take on the challenge of trying to put the plug back where it belongs.