You have to give us some kind of idea of what part fell off. We can't guess over a computer. The thermostat is inside a housing that is bolted to the engine. It is not going to fall off.
A quick way to tell if the fans are working is to unplug the two-wire coolant temperature sensor while the engine is running. The fans should turn on within one or two seconds.
Tuesday, April 12th, 2011 AT 11:00 PM