For some years now after using the car that the fans or whatever it is runs for quite a while, sometimes people have said the engine is still running. I did post this on the forum and it was said it is regenerating.Yesterday my neighbour said  its the electric fans running , not regenerating, so what is it really and why. Must mention it comes on after 10 mile shopping run to 80 miles at 60/70 mph.

Its both, the former as a consequence of the heat build up and fire risk of the latter.

Thank you

Now getting concerned as to why the fan is running when engine off for some time even on few mile run , is something going wrong?