aux electric fan
#1
#2
The point of a fuse is to protect the electrical system from causing potential damage to one or more components. If you want to test for a short use a multimeter and check the resistance between the connections. If you get 0 then you have your confirmation that it is a short without the possibility of starting a fire.
#3
With the engine not running, use a long skinny screwdriver, metal rod, or dowel rod to reach through the grille and see if you can move the electric fan blades (they should rotate easily) if, as I suspect, they are frozen in place then the fan motor is locked up and is why the fuse blows. This is a common failure. There are many options on how to fix it (replace the fan), I got a used one from a scrap yard but that's just how I approached it.
#5
All of the above. The fan should spin freely (the one in front of the truck). The bearings start to go, heat up, drag the fan down toward what motor guys call "LRA - or locked rotor amps". The fuse is set below this point, so it will prevent a fire. This is a D2 motor killa, because it is stealthy, people don't realize they are missing that cooling. You also don't have a second fan, like a D1, to compare to.
#7
#9