Hi its probably the fan control unit on the fanpack at the front by the radiator its 1-2 silver boxes on the cowling with electrical plugs, if you bridge the plugs live and earth and the fan comes on its the control packs but the easiest way is to turn on the airconditiong and watch the fan for movement it could well be that its not getting hot enough for the fan to work, the only other component to look at is the coolant temperature sensor.
Steve.