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Please forgive me, I have read the two main threads on aux heaters (Link1, Link2). I have the same questions as most. How to get my aux coolant heater to heat the engine \ cabin without the engine running. My vehicle, Caravelle Exec build date July 2020, has factory fitted Aux heater...

On my 2017 T6, I have a Webasto auxiliary/water heater and Eberspacher air/parking heater fitted at factory. The remote and timer only controls the Eberspacher air/parking heater. The Webasto aux/water heater only kicks in whilst the engine is running and the outside temp is 5 degrees or below...