Ok today july 4, i notice my car was over heating. So i thought maybe i was low or out of coolant, i was low so i filled it up. But i then noticed that due to mine and my girlfriends lack of experience we put old oil into the cooling system. This i know how to fix by flushing the system but i then noticed that my cooling fan for my engine is not turning either. How can i check to see what is causing this problem?