A Haynes manual would probably be a worthwhile investment as it has the relevant information along with pictures / diagrams that would be useful to you, here is some relevant information from the manual which I hope is useful.
The switch (thermo unit) is contained within the thermostat itself, the temperature LED should come on for a few seconds when you turn on the ignition this is supposed to indicate that the circuit is good. If you want to test the switch you'll need to remove the thermo unit from the thermostat housing and put it in a saucepan of coolant and raise the heat with an ohmmeter attached to the terminals. At 80c you should have 3.4 - 4.0 K-ohms at 105c you should have 1.6 - 1.9 k-ohms.
There is a fan specific fuse in the main fuse box, so you will probably want to make sure that this is OK if it is blown check the wiring.
There is a cooling fan relay under the left hand side cover, to test this set a multimeter to ohms x 1 and connect the positive probe to the brown wire terminal on the relay and the negative probe to the blue wire terminal. Use 2 insulated jumper wires to connect the positive terminal on the battery to the brown wire terminal and the negative terminal on the battery to the green/black wire terminal. You should hear a click and the multimter should read a continuous 0 Ohms.
If you want to check the fan, raise the tank and trace the motor leads back to the connector and use 2 insulated jumper wires to connect the positive battery terminal to the blue wire terminal and the negative battery terminal to the black wire terminal.
