Can someone explain how it works? I have put a new glow plug in my aux heater as mine was smoking and not heating, this has fixed this and heats up ok. But now heater cuts out after about a minute or so. I have looked on vag-com and one of temp gauges goes up to 270 and faults overheating and the pump is saying off. If I go on a run the aux heater is working but it takes about 5 mile or so before car reaches working temperature. The car has done 120,000 mile so assume from posts on forum that pump brushes are u s. Is the aux heater working because water circulating through engine and therefore around aux heater keeping it cool? Should you hear pump working when stopped with aux heater running? And if the system is working properly how fast should car warm up just ticking over.
