QUOTE(danishfx @ Mar 1 2013, 03:46 PM)
Yes bro...fan normally cooling the Radiator that having hot water..then after cooling the hot water it will flow to our engine back..so i think there is no point to turn onn the fan after switch off the engine..huhuhu hope during my 1st service the Peugeot Technician / Supervisor can explain me further..
Bro you are absolutely right in cooling the water before it can be pumped into the engine water jackets to cool the engine. The fan at the radiator cools this water and ofcourse ram air due to forward motion of the vehicle. You have successfully cooled your Lion.
However the turbo is not happy. Turbos spin to something like 150,000rpm. I forget the temperatures generated of my head,unless I dig up my old torn notes,that too only if I find them.....hahaha! To keep the turbos cool and running happy,most use fluid bearings. A thin layer of oil is constantly pumped on to the shaft that supports these bearings. Whilst the oil cools the shaft and bearings and allows it to spin without much friction, it picksup tremendous heat. Don't forget the turbo gets up to 150,000 rpm. The heat generated here has to be cooled too. As suggested by bro jfcheang,not pushing your car the last few kilometers before reaching home helps a bit.
Older turbo cars used to have timer running the engine at idle for a few minutes to let the oil cool off. As you know,after shut down the engines ran for a while. A more effective method of cooling is to completely shut down the primary heat source,ie the engine, and cool the oil by a fan. Dissipation of heat by this method is much more efficient/faster, and does not consume fuel. Hence on our Lion the fan has to run a few seconds depending on heat level.
Hope this helps!