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Just wondering what this button does as I cant seem to find it in the manual. Its below the fan speed button and is a long button with a curved arrow on it...

From memory I'm pretty sure you're talking about the air re-circulation button.

Stops taking in air from the outside, and just (as it says) re-circulates the air already in the cabin. Useful for if you're stuck in traffic behind some old diesel bus pumping out loads of fumes.

Yeah that's it Redline, recommends you don't use it for long periods of time.

And it works in all modes except windscreen lol

thats wat its for yea... the recurcilation button.

if it doesnt work in windscreen mode that might be why i kept thinking mine dont work. either that or it is broken