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Originally Posted by wheela
I seem to recall reading it had something to do with the air conditioning? My wife's old 2013 f30 328i had that problem, but I haven't really noticed it on my 2015 e84 35i. She had the dealership do something to it, and it worked for a while, but eventually the smell came back. I just can't remember what they did, but thought it was something with the a/c. Sorry that's not super helpful...
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See below, but yes it's kinda all tied together but the panel breaking down seems to be right where the hvac system is so it makes sense. I have heard of other f series cars fixing it with a panel behind the dash that was degraded and offgassing this smell. I really want to track it down as best as possible without destroying the daily ripping the whole dash apart to find it. I will if I have to, but I really don't want to. It started mild but it is growing with age. I've done all the usual stuff cabin filter etc. it's 100% distinct crayon and if you Google bmw crayon smell you will see I'm not crazy at least lol. I just need to pinpoint the source of it on the e84 platform.
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Originally Posted by Gamb1t
Did you or someone in your household shuttled kids in recent past?
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No it's a common issue with bmws and apparently other German cars. It's got to do with insulation/sound deadening material breaking down from what I've researched so far. Between the dash and engine bay somewhere.