button on my climatronic unit?

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pachanga 231

Active Member
Joined
Dec 23, 2013
Messages
515
Car
E280 cdi sport 2007
Hi what is the button bottom right (under demister)

ForumRunner_20140328_155149.jpg
 
Filters out noxious fumes.
 
Ill probably never turn it on
 
I thought most systems with it fitted switched it into operation automatically. There's a multi sensor in the cabin air intake.
 
Thanks peeps
 

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