The heater fan motor quit on my 2002 Ford F-150 Super Cab and I can't find a fuse for it. How do I repair it?

What have you checked so far ?
Fuse - resistor - power at the blower motor ?

If you have a multimeter or 12v-24v light probe attach one lead to body of vehicle (vehicle seat bolt in floor is a good place), in the case of meter, black lead goes here, light probe has alligator clip, then other lead push point into leads on motor red one should be live with ignition on & fan on max, if no power then I'd say check fuses & the fan switch, try removing plug near fan motor & applying 12v directly to the two wires, it should not matter which way you wire this, it will still run if it's going to, but if one is red & the other black, then red is positive.Good luck, these motors very rarely give out, my guess is the switch...

This sounds like an issue some 97-03 MY F-150s have, where a windshield ( or roof panel ) leak down into the area by the Cab fuse panel, and soak the GEM ( Generic Electronic Module ), causing all sorts of strange problems.

Depending on how long this has been happening, resealing ( or replacing if bad enough ) the windshield is in order, and dry out of the dash area with a small space heater can cure the issue.

If this has been happening too long the GEM to Cab fuse panel ( it is bolted to the back of the cab fuse panel ) connector pins can be discolored / corroded and the fuse panel / GEM needs to be removed and the pins cleaned ( hard to do on the female connector ).

Here is the manual section on GEM removal for the 1997, the process is very similar on the '02 MY F-150
http://my.voyager.net/~sscully/1997F150GemRemovalandInstallation.pdf

try disconnecting the cluster fuse and the radio fuse and see what happen if everything work...u might have an open circuit or a short on one of the electronic in your truck

It is the fuel heater, All you have to do is unplug it.

Sounds like you need to replace your heater core.

Good Morning,
You can check the fuses and also if you can unplug or splice into the blower motor wires, you can jump wire the blower motor directly to the battery and it should work! If it don't you need a new blower motor. Please let me know if this helps you and thank you for using FixYa!

There are 4 things to check out to pin point the problem: the switch it's self, the blower relay switch, resistor block, and the blower motor it's self. good luck

does motor run on only one speed? if so replace the blower resistor.
if it just quit , check for power at the blower motor, if u go power then replace the blower motor

there is not one near the fan i beleave this is not a relay you need to replace if your fan does not work you need to replace the resister whitch is a circuit board that is attached to the wire that plugs in to the blower motor