My works van is a Nissan Nv200 with the Renault 1.5 diesel (2010). When I start it most of the time the fan comes on and stays on whatever sort of journey it is. It doesn't do it all the time and it is from cold so I it cannot be overheating and when sat it traffic and it is warm outside it goes off. Any ideas what could be causing this? The only other issue I have is first thing on a morning when you start it, it does seem to take an extra second or two to fire up compared to when it warm, is this normal? The oil light stays on for about 4/5 seconds from cold as well.

Cheers for any help.