purchased a 03 tdi last year, going through its first winter with us am very concerned about the air con unit. the booster heater sounds like a jet engine and stays on for more than the suggested 10mins, the controls seem to have a mind of their own and even when I put it on manual the levels still fluctuate. After numerous conversations with ford about this still no nearer understanding whats going on. Please any diesel galaxy owners able to tell me if this is common in new models?