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      01-18-2012, 02:05 AM   #3
parapaul
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Drives: E91 330d M Sport
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That's how I understand it - and it's worked the couple of times I've tried to use it.

Engine must have enough heat to warm the air flow.
Engine off, but keys still in so ignition on.

It doesn't last very long, even with a hot engine though.
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