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Could be a bad connection at one of the fuses, or a coincidence and has nothing to do with the fuses. It could be the blower motor, resistor, or a connection somewhere.
You would need to check the blower fuse for power with a meter and then the blower motor when it fails to run.
Either you have a blower motor FUSE that has gone bad "typically the problem" or you have a burned out blower motor. Usually the cause of a blown or burnt motor if not a Fuse, Is caused by the vented air from outside letting debris like sticks or leaves,acorns etc. enter the fan box. If ANY of the mentioned items get caught in the "blower box" then it will usually blow the fuse and or burn up the blower motor. Start in your fuse box and look for a burnt fuse and replace with same size fuse. If it blows the new fuse quickly then you have debris in "Blower box" that will have to be removed before adding yet another fuse. I have had the same problem and I found a bunch of leaves in my "Blower Box". I removed the leaves and replaced the burned out fuse. And I have had no more problems with the blower motor blowing air.
At the central junction box, check 15A fuse 16 which feeds the remote climate control (RCC) module. Check 10A fuse 28 which feeds the RCC module and the blower motor relay. Check 40A fuse 6 which feeds the blower motor relay.If the fuses are OK, start the engine (the blower only works while the engine is running). There should be 12V at the PNK/WHT wire connection to the front blower motor speed controller and the blower should be operating. If not, the controller may be defective or the blower motor may have failed
Check fuses 52 15A and 51 15A in the underhood fuse box. Check the Blower motor relay behind the right side of dash. Check the fan control amplifier (controls fan speed) behind right side of dash. Sound more like a blown fuse or bad blower motor relay
check the blower motor fuse, then you can turn truck on put the speed control to high. if fuse is blown replace fuse, if the speed control only works on high, the blower motor resistor needs replacing. It is on passenger side under glove box in close proximity to the blower motor. The fuse is under the hood on driver side. the cover should say fuses/relay on the top of cover, on most ford vehicles you will need to look in the owners manual for the position of the fuse.
Have you checked for a blown fuse first. There are two fuse control panels - one under the driver's dash board and one in the engine compartment. The one in the engine compartment should have the blower fuse. If the fuse is good, check the blower relay (this is also in the engine compartment). The cover to the fuse box has a diagram of the fuse locations and descriptions. "BLWR" is usually used for blower.
Was the blower making strange noises before it quit? If not, does the blower work at all? perhaps only on one speed? If it only works on one speed, look for the resistor that goes with the blower motor. I assume it will be near the blower itself, but can't tell you where. An auto parts store can probably tell you. If the blower was noisy and suddenly quit, you will likely need to replace the blower motor.