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Gary, when I tried MM's link all I got was an error message :D , so for clarities sake I will spell it out for you:

Jet engine noise is an auxiliary heater as the TDi engine generates so little heat of its own. Switches on when coolant temp between 5 and 75celcius. This means it should turn on first thing in the morning, and off when engine is at normal operating temperature. On a particularly cold day you may also find it switches on during or at the end of a trip as the exposed pipes to the rear cabin heater cool the overall temp of the coolant whilst on the move. You should also hear a ticking noise from the rear of the car - this is the separate fuel pump for this heater.

They are a common source of trouble in diesel Gals - often manifesting as a cloud of white smoke from the back of the car if malfunctioning, or a shiveringly cold cabin if not functioning at all. Many, many threads on this topic through the forum, so try a search with any of the key words above :blink:

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