Ford Curier heating

Hello everyone, I hope you can help me with this problem.
I have a Ford Curier the problem is that it is heated a lot and does not send the signal to work the motorcycle and cool the engine, which to get out of the hurry had to put a bridge in the electrical fan system to cool the engine help me with the fault ...
can it be the temperature sensor ???

The first thing checks the thermostat if it works well and does not work, then check fuses and controls the relay of the electrventilator that is behind the battery, tell us how you go, greetings.