I read this thread with interest cos, you guessed it, aux heater not kicking in! So, question no1 - if there is a fuse, is it with the other fuses next to the steering wheel, and if so, what number is it? Question no 2 - what does the temp sensor look like? (will take off the plastic wiper cover thingy later and bridge the connections to see if it will fire up) Question no 3 - is VAG COM a fault reader thingy? Do I need to have one if I decide to replace the glow plug in order to reset the fault? Cheers fellas. This forum's ace. Already used it when replacing my front brakes for the first time and also when replacing a track rod end. Saved me a fortune by giving me the confidence to do it myself. Hoping I can sort this aux heater out myself too! BTW the car's a 2002 Seat Alhambra 1.9 TDI SE.