i have a 2003 gmc sierra 2500hd, in the passenger side vent on the dash, that little circle one along the side defroster vent i think, it is causing a terrible smell, popped it off saw nothing from just looking in there but it smells bad, something is probably deeper in that vent, if anyone has advice let me know, might need to tear my dash apart to see if i can get whatever got in there out
Found the issue, turns out it wasnt a mice nest hidden anywhere, opened the hood to see if i can find a trail, but turns out it was my battery leaking and swelling with a hissing sound, so it was the battery causing the bad smell
@mckay288 you didn't open the hood before posting online??
@mckay288 I didn't know batteries can smell that bad, I've learned something today. Thankfully it was just that and you didn't own a Mercedes on top of it.
@MountainManJoe yeah didnt think it would be anything under the hood at first, checked under it maybe an hour or two after posting, was just busy at work and verified what the problem was once i had some time
@SoftestEeve yeah i didnt think batteries smelled that bad at all, thats why i thought something died in my truck somewhere, glad i dont own a mercedes either, those are pricy, my truck is probably cheaper than their batteries alone lol
did something make a nest in your cowl?
bad smells are also caused by a backed up AC evaporator drain. They get full of mildew. There are foaming cleaners with long tubes you can buy for that. And clear the plug of course.
@imperator mostly suspecting a mice nest is hidden somewhere, looked at a couple videos of people needing to disassemble their dash to get them, depending where it is, ill look at my A/C as well and clean that up too.
unless you left the door open, they shouldn't be able to get into the dash