The fan switch is a little round button with two small ears on the upper most cooling fins on the upper RH side. You'll see two wires ... one going in ... one coming out. It is just a little bimetal "clicker switch". I've never seen one fall off as there are two small sheet metal screws holding it on to the fin. Trace the wire from the fans as it may be laying behind the coils somewhere with the clicker switch still on it. If so just plug the wire back in and screw it back on to the top cooling fin. (NOT THE COOLING TUBE)
It will look something like this.
http://rvcoolingunit.com/Fan-Switch-...-P1802601.aspx
Hybrid Mode
