melted fuse for radiator fan 99 Beetle

My 99 Beetle was overheating. The fan was not working. When I checked the fuse in the circuit box on top of the battery it was melted all around the fuse. Any ideas on what caused this?

bad fuse pannel on top of battery. good thing u didnt have a engine fire like this guy did.
http://cgi.ebay.com/ebaymotors/Volkswagen-Beetle-New-1998-present-1-8T-1998-Volkswagen-Beetle-Rebuildable-Repairable-Eng-Fire_W0QQcmdZViewItemQQcategoryZ31876QQitemZ460093 3690QQrdZ1QQsspagenameZWDVW

also problably a bad coolant fan control module (located under the battery tray)

bad fuse pannel on top of battery. good thing u didnt have a engine fire like this guy did.
http://cgi.ebay.com/ebaymotors/Volkswagen-Beetle-New-1998-present-1-8T-1998-Volkswagen-Beetle-Rebuildable-Repairable-Eng-Fire_W0QQcmdZViewItemQQcategoryZ31876QQitemZ460093 3690QQrdZ1QQsspagenameZWDVW

also problably a bad coolant fan control module (located under the battery tray)

Is that the same thing as the auxilary fan control unit? and how would I know if it is bad or not?

from the fuse being melted or the fans can also cause the fuse to melt