So what is it?

Soldato
Joined
20 Oct 2002
Posts
12,005
Location
Derby
I have been meaning to ask this for a while.

So on most newer cars I have owned most of them have what looks like a little button inbetween the vents right under the windscreen. Most of the time they change colour over time. I thought it may have been something to do with the pollen filter but now I don't think so.

Sooo what is it?
 
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