the fuse is made to blow when it gets more than the stated amounts of amps being pulled... i have a meter that clamps on one wire to see how much amps are going through a wire...
this is what you need to find out how many amps is going through the wire... if its more than the fuse then they not gonna work...what you need to do is remove the fan or the wiring to it and run the motor via a jumper wire and then put a clamp on amp meter on the wire to see how many amps it is pulling... if it not over the fuse rating then its not the fan motor....try alot of different ways: like the fan on heat, the fan on a/c, the fan on defrost, on vent...
and if it only blows when in one mode then associate it to that mode.... if all modes then its the fan or the wiring to the fan.... probably a bad wire in the system.. i have alot of underhood frayed wires that i had to seperate and patch up with Liquid Tape... a plastic rubberized liquid that you brush on wires to cover it for insulation of the copper wire....
