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AlexD
What does this button do?

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psg1ben in reply to @AlexD

Circulate the heating somehow?

^that's a guess
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gbj_tester in reply to @AlexD

Air recirculation. It takes cabin air and pushes it through the heater, rather than taking fresh external air.
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duncs in reply to @AlexD

Novel reverse gear placement.

Either that or recirculates air rather than bringing fresh from outside.
Edit: What tester said

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