ok Guys, stupid question time, i am on my second freelander 1, had the last td4 s for 10 years great vehicle. I recently found a very low mileage td4 hse (55 plate) which i could not resist. All the toys work, unfortunately there wasn't an operators manual. Any way there seems to be some sort of heater/emission control unit which continues after the engine is turned off, smoke emanates from nearside. Local fuel station thought it was on fire!! whatever is operating comes with a suction type noise. What is it and how is it controlled thanks!