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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-27-2005, 04:09 PM   #1 (permalink)
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I have a 2000 e39 540 sport AT. On the dash near the climate control fan button is another button with "Rest" on it. Ive pressed it, dont think it does anything, the led indicator has never lit up. So, can anyone help me with what this button is supposed to do?

Thanks, Jason.
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Old 04-27-2005, 08:42 PM   #2 (permalink)
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If I'm not mistaken, I think it directs warm air from the engine bay into the interior after the engine is turned off...or something like that, check the manual, it's in there.
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Old 04-27-2005, 08:59 PM   #3 (permalink)
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It's the "Residual Heat System." Cosmos is right, it activates an auxillary heat pump which heats the interior of the car for about 30 minutes after the car is turned off. It operates only when the key is in position 1 & 2.
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