Both of these fuses are for the cooling fan system , and when the power for these fuses are used they go to the cooling fan motors and nothing else , so if the cooling fans are new then you must have a short in the harness from the engine compartment fuse box to the cooling fan motors ----or are you putting to low of a fuse in the fuse box ,,they are both 50 amp fuses ?????? if you are useing to low of a fuse ,they will burn the fuse up.
if you are putting the proper fuses in ,,,then you must check the harness going from the fans to the engine fuse box ...
we can go back and forth on this page
no - dont add more money ----------I would put two 50 amp fuses in it and see what happens ,,, the cooling fans draw a lot of amps and putting a 40 amp in it would probely blow the fuse --- I work at a Ford dealer and the Ford manual shows both to be 50 amp and the all data also shows both to be 50 amp ------its a cheap shot in the dark --- but this ware I would start .....if it still blows the fuses ,,,then i would start to look for a short in the that harness from the fuse box to the fans
If you need more help on this ,,,just drop me a line on this same page ---and we will go from there
Yes there should be a a/c diode in place