With the engine running - the Max button gives you maximum cooling (A/C on & heating off). With the engine recently switched off (if outside temp is below 15°C) it brings on the fan low and circulates the coolant through the heater box (allows occupants to keep warm for a while with engine off using residual engine heat).

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Cheers, Brian

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2001 X5 4.4i Sport
Black Sapphire, Hi Gloss Shadowline, Full Privacy Glass.
Too Cool for Jack Bauer