OK...for some REAL help, I'll tell you what to do, NOT what happened to me last summer at band camp !!!!!!!!!!
I'll write it as if you are a noob (tho you may not be, but some reading this will be).
My experience has been that the resistor does not completely fail, only 1-2 of the coils, and high speed won't unless the fan motor fails first. (5 years Toy dealer)
OK... so...you already checked the fuse.
Get to the fan motor electric connector plug (by removing whatevers needed) and disconnect it from the fan motor. Using a test light, clip the 'alligator' end to a good ground (usually a body screw will do).
Test that the light works at 'that' ground by now touching a 'known' good power source, like maybe the cigar lighter with the key to 'on' (so all the dash indicator lights are on). Turn your heater on like you want to use it on high fan. Then poke the 'ice pick' end of the test light into one of the 2 connector ends on the fan motor plug (I'm not looking in diagram, so I don't know the wire colors). One will be the 'hot' end. Did not light the tester ??? Then poke it into the other wire connector. ONE of them should light the tester. No ??? Then test the resistor.
The resistor is mounted into the ducting box, just below the glove box. You will see it from passenger floor. Its approx. 3"x2" with big plug. Remove plug and test all the connectors in the plug. One of them Not lighting the test light ??? Then power is not getting that far, and you will have dig around in the TSRM for further testing back up the system.
Also, as mentioned by above post-er, the low speed resistor is what usally goes bad. It can be repaired. I recently (last 2 weeks) layed that out for someone in another thread.
PS. soccer balls are for kicking, not expensive car parts !!! :biglaugh: