VW Crafter original factory fit aux heater to engine pre heater??

G-A-R-Y

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I have a Grand California with the aux diesel heater controlled from above, this heats water in the cooling system and blows hot air out through the dash vents, it can be used three times a day upto 120 mins a day???(don't know why, perhaps battery voltage)
It is fitted centrally under the van and is just about silent in operation.

I think it's 5KW, I discovered it can also be used to aid/boost the heater with engine running too by simply pressing that same button.

When stationary it does not cycle the cooling system although the header tank does warm, it just heats the cab heater, is there a way to make this an engine/block pre heater.

Does this van have electric or manual water pump??
 
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