I have read loads about failed and failing aux heater glow plugs, and was sure that this was the problem with my wifes galaxy. However i removed the heater, took it apart and looked at the glow plug. I then put current through it and it glowed red hot. anoyingly the heater still doesn't kick in through the cold weather. Where do i look now? Please help as the wife is fairly miffed having no heater in the car with the snow all around!