...I test it to be sure? The engine overheats when sitting in traffic and I don't see the fan turning, where is the electrical connection to test it?
My mate says it could also be the sensor, how do I find and test that?
Fan is generally pretty reliable, You need to check the fuse, the sensor and the relay. I would think the relay or fuse is the likely fault. With all the electronics on a car I wouldn't go poking around the wiring unless you really know what's where. I'd start with a look at a Haynes Manual
If you are talking about the electric fan, there should be a cable coming out of the thermostat. Remove the cable and start the car. If the fan works, it should fire up immediately since you have disconnected the sensor.
If you are talking about the electric fan, there should be a cable coming out of the thermostat. Remove the cable and start the car. If the fan works, it should fire up immediately since you have disconnected the sensor.