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The first thing that you need to do is locate the thermosta housing which is located at the base of the engine connected to the upper radiator hose. This housing will also contain the radiator fan switch.
If your fan is not turning on the first thing that you need to do is to check for blown fuses or bad relays. Please see your owners manual for fuse locations.
test the fan switch.
You need to check for an open short in the system so do the following.
Disconnect the plug going to the sensor and check the the plug by connecting the voltmeter to the number 2 pin on the connector and body ground, turn the ignition switch on and check to see if there is voltage. If yes then the wire is good.
If no voltage then you will need to repair the short in the system.
i will need for you to tell me if you have hot air coming out of the heater. If not then you need to bleed the cooling sustem for air.