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For the blower speed issue look at the speed control resistors. They are mounted on the Evaporator housing just below the HiBlo relay, on the passenger side under the hood. The relay bypasses the resistors and puts full 12v to the fan on high.
Here is a schematic
Check ground(black wire) from blower motor.
It goes from the blower threw a gromet in the fire wall to the fan switch.
I had a similiar problem and it turned out to be a broken wire just infront
of the firewall on the engine side. GOOD LUCK