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2003 Cayenne Turbo - Cold climate package It all started out with the classic failure of the plastic cooling pipes. My wife was driving the car when a severe coolant leak emerged - and after the failure she "had to" drive the car a few more minutes before stopping. What happened in those minutes will never be entirely clear ..... so be it. When I arrived at the scene to access the damage I switched on the car (without starting) to hear a DRY pumping noise - and immense rattling coming from the driver side fender. Clearly an electrical (additional coolant pump) running dry, so I just switched off the car and had it towed. 10 days later I finished the coolant pipe upgrade/repair and refilled the cooling system without using the vacuum filling procedure that is recommended by the workshop manual. Result: No heat coming from the cabin heater. So I suspected some air blockage in the system. But after following the workshop manual bleeding procedure - and other maneuvers, s.a. lifting the front of car while reving engine/removing driver side radiator hose etc/running pressure through the system etc = no improvement. Also, the engine heat gauge is overly hot when idling - but returns to normal under higher rpms. So, is it possible the the additional water pump has failed ? Is this pump feeding the heater core and the heat sensor cooling manifold ? Is there other likely cause for this failure ? All and any help would be appreciated :)