I arrived home after a long motorway journey and noticed that the engine fan was still running after I had turned the car off. This continued for quite a few minutes but is perfectly normal behaviour although only happens occasionally.
When the car has been on a long trip the DPF (Diesel Particulate FIlter) will sometimes start to regenerate and burn off the soot that has collected in it. This generates excess heat which can be dissipated when the car is moving but when stationary needs fan assistance to cool it down and prevent damage.
So if your engine fan runs after the car is switched off don't panic, it's normal for a diesel with DPF fitted (most diesel cars after 2007/8 in Europe/UK) and will stop after around 5 mins.
