My engine is overheating especially when I have to park or drive slowly. Not at high speeds. I have a switch under the dashboard that is suppose to turn the fan on but it doesn't work anymore. I even tried replacing the switch...

Now I have no knowledge of how wiring and everything works....so could I get some advice on what could be wrong and where to start looking? Does this switch hook to the battery?

Try and follow the wires from the switch. There should be a power source and ground basically. If you flip the switch and get nothing, theres either a bad connection somewhere, bad fuse, or your fan motor is burnt up. Just check all your connections and make sure they're good.

Okay sounds easy enough.