An update, because I went through alot to figure out what was wrong.

First I tried to remove the blower motor, that took forever because I
didn't know that you need to remove the control unit on the floor
underneath the carpet to get enough clearance to slide the blower
motor assembly down and out.

Then I went around looking for a new blower motor assembly, the motor
itself is $180 CDN and doesn't include the assembly which I need
(couldn't remove the blower wheels from the old motor). I went to my
dad's friend with the blower motor and asked him if he could fix the
motor or find another motor, he hooked it up to a car battery and it
worked.

So I put it back in the car and two weeks later it stopped working
again. This time I went to a mechanic who said that the blower motor
assembly needed to be replaced, I pointed out that it had worked
before. He said that was because it was getting full voltage and
current direct to the battery, which it doesn't in normal operation.
Estimate was $380 CDN.

So I went to the auto junkyard and got a used blower motor assembly,
and installed that.
Five or six weeks from then and the fan still works.

The Haynes Honda Accord '91 manual was useless. The Chilton's manual
was slightly more helpful (it actually mentioned the EXR). Newsgroups
and google were really helpful.