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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