The thermo fan fuse prevents the wiring or the motor from melting from a short circuit.
THINGS TO LOOK FOR
Fuses don’t just blow for no reason at all, they blow when they are overloaded. If a fuse is blowing as soon as you put it in, you need to have an auto electrician check it out. It shows that there is a definite short in the system causing the fuse to blow.
IS IT EXPENSIVE TO REPAIR?
Replacing a ceramic or glass fuse is inexpensive. A good idea is to carry a few spare fuses in your vehicle.
TEMPORARY REPAIR AND LONG TERM REPLACEMENT
It is usually a 15-20 amp fuse. If you try a 25 amp fuse and it blows go no further but remember if you have air conditioning turn it on as it may switch on an additional fan and drive at least 60Kms. This will also keep the engine cool.