The cabin wont get hot then.
You might not have the correct pump fitted to the heater.
So all its going to do is boil the water around the heater.
You need the pump or engine running to move the hot water around the system and into the heater matrix to benefit from it.
Mine gets up to temp with in 5mins with the heater running.
Almost 15/20 with out it.
EDIT: I did read that the aux heater will lock it self out if it gets to hot and wont work again till the error is removed via VCDS. That might have been on here somewhere.
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06 3.0TDI Quattro:
Options:
Soft close Doors & Boot, Electric Blinds, Keyless Entry & Start, Bluetooth HandFree, Quad Zone Climate, APS+, 3 Spoke Sports Tiptronic Multi Function Steering Wheel, Heated Seats All Round, Black Leather Comfort Seats, AMI, Sunroof, Drivers & Passenger Electric Memory Seats, Auto Dimming Mirrors, Bi-Xenons AFS2, Dab, Digital TV, Reversing Camera, AV Inputs, Fridge, Solar Roof, TPMS, facelift rear lights, 3G, remote boot closure, Tow Bar.
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