you will find the problem is not your fan but the thermostat switch that is conected to the radiator if you are not to confident then find somebody with basic knowledge as this is a simple procedure,first remove switch from radiator this is the only thing connected to the radiator with wires attached this needs to be unscrewed ,take switch into house and place in bowl of boiling water if the internal part of the switch (part that normally sits in radiator) if this remains open or closed and does not change position then take part to car spares shop with veichle detailes ,reg/ year/make /model/engine size you should find that if this is the problem then simply replace and refill radiator with water as you will loose a lot of water during this process
brian
June 2005