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On the Powerstrokes (7.3 anyway) the intake heater is not used except under certain conditions. I can't remember excactly but is something like idling for over 5 minutes under 32* parking brake set. It rarely happens and the heating coil is a large obstruction in the intake. Most, including myself have removed it and plugged the hole.
There is a plug with a place to hook up boost gauge that is pretty slick.
This is of course totaly seperated from the block heater.
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