1990 honda accord ac blower motor will not work

Check 7.5 fuse (#8) inside the car by your left foot and check the 30 amp fuse in the engine compartment (according to your diagram on the inside of your fuse box lid).

You can replace the fan motor pretty easy but you'll want to unplug it and test it first by running an automotive battery to the plugs of the fan with 2 jumper wires. The fan is above the right foot of the passenger area. There are three 8mm screws to remove then it drops out. Careful with the wiring.
If your fan is still good, you'll have to consider removing your knob and switch assembly to see if something is unplugged in there. Good luck.

There no fire to the ac conpresser!