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More than likely you have an internal fault either in the fan itself or the thermostat that activates it.
For a fuse to blow it has to have a lot higher than normal current draw through it, which is normally refered to as a short. If the fuse blows almost immediately then I would suggest you unplug the fan, and see if the fuse blows with just the thermostat in the circuit. If it blows - replace the thermostat control. If it doesn't blow, plug in the fan and watch it. If it trys to start and then blows the fuse, replace the fan motor.
More then likely will have to replace fan motor, fan motor is weak and asking for to many amps to work, and that will over load and blow the fuse, if it was wiring the fuse would blow right away, replace fan motor.
Probably because the fan is bad. Does it blow right away or after a while? Get another fan, plug it in before replacing and see if it blow the fuse. If not, it's the fan. Or, simply unplug the fan and see if the fuse blows. This will eliminate a short in the wiring, etc.
About the only thing that would cause the fan fuse to blow is either the fan has a problem and is dragging or a short in the wiring. I would bet the fan motor is probably bad. The hoses and thermostat have nothing to do with the fan motor fuse blowing.
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