I think there is a relay mounted in engine compartment beside the blower
that control the fan speed. Give it a little tab to jump start the contacts
or open it up and clean the contacts to test it. If it is, buy a new relay
from any automotive supplies. (I had similar problem on 1993 Transport.
Not sure on 1997)
Not sure what screws you removed, but below the blower motor there is a
connector that plugs right into the back of the resistor pack. Around this
connector there are three screws holding it in place. Remove them and the
resistor pack will come out of the air duct.
Take a picture of the area and post it on the internet.
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