Hi Moby, I'm pretty sure you'll end up changing the glow plug on the heater. Seems to be a general problem with the system. I've read bunches of posts related to the same problem, and just had it myself. The aux heater won't start, no jet-sound, takes a long time to get warm air from the air vents, motor temp lower than usual..... You'll find some posts with tips and tricks in case you want to do the job yourself! Good luck! Masawa '02 Alhambra 1.9TDI, chipped to 140hp Region: Norway