Renault Scenic II fan fails quite often. In some cases, you may notice that not all speeds selected from the dashboard works or works occasionally. But most often fan stops working at all. Of course, the first step to check fuses. If fuses seem to be OK, then the only way to look is at the fan speed controller (sometimes called fan resistor). The easiest and most expensive way is to call service and leave them to do repairs. But if you have some engineering blood, you can do it yourself by spending less than an hour of your time and probably only a couple of bucks.