My Girlfriends 199 318Ti is experiencing interior foggin during cold weather (up here in Canada). I suspect it is a clogged cabin air filter reducing ventilation. I took out the glove box and looked for the filter but no joy.
I did look at some E36 filter change postings but the ventilation system arrangement is different.
As an aside I did try the cabin recirc button which illuminates. I can't tell if the actual valave/flapper is working properly. This is a fogging similar to if the cabin air was on recirc. Side and rear windows fog heavily, front windshield can only be kept clear with defrost setting and fan on high.
I have checked for leaks/wet carpet but nothing there.
I think you're on the right track about the flapper. I had to have one changed on my 98 328is. I don't know if it's the same on your car but they said mine was a PITA and bought the whole duct and just swapped out the flapper. I think they said they used mirrors to see what they were doing.
Cosmos schwartz metalic Sparco strut brace factory X-brace 55w 6000k HID w/LED angel eyes smoked Lamin-X blacked out sidemarkers,tails and brakelights. DDM smoked corners and pedals. 35% tint all around, Prosport water temp and oil pressure gauges, Home Depot lip, M3 rear diffuser ASC-T delete.
Thanks for the info, I sense I'm getting warmer...
How do I get to the plenum.
I did remove the center grill between the wiper arms. This revealed 2 philips screws that released the plastic box below. This bow looked promising but only contained wiring harness (I popped 2 of the 6 retainer clips ope on the passenger side to reveal the harness).
I also removed the battery and box, revealing what i thought to be the cabin air inlet (wrong).
So anyway is there a diagram, exploded view, or tech posting that shows the plenum? Possibly a photo that even deals with another component that has the plenum visible will work.
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