I purchased a 1.9 tdi four years ago. When purchsed, the aux heater when cold fired up, but I also had a clicking/ ticking noise as well. I took it back to local dealer (Ford) but they said there was nothing that could be done ? Has any one else heard of this problem, if indeed it is a problem, I am sure the heater works okay, but should the heater make this noise?? Can any one help with this?