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      12-08-2008, 08:25 AM   #3
PhilR
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Drives: E93 330d M Sport Auto
Join Date: Mar 2008
Location: Teesside / Surrey

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Threethirty, if it works like the wing mirror demister it may only activate when below a certain temp, unlesse the auto wipers are actually turned on too.

There are certain temp paremeters controlling the level of heating applied without the auto wipers on etc.

I had this issue with wing mirrors not clearing and sure enough I needed to activate the auto wipers for it to kick in.

This may be the same for the rear demister?
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