Hey guys! Ive recently bought a 98 audi a3 1.8t.

Ive got a problem with heating. When i drive the car, the temps fall down and when its on idle for around 5-10mins the temp will slowly start to go over the 90c.

I took it to a mechanic and he said my thermostat and water pump is fine. The fan doesnt seem to spin at all? He checked the fan switch and theres no spark goin into the cables.

Now i need to know which fuse is related to the fan?
Also could it be my relay?