[targa80]

There are two blower motors.
The first is the fresh air blower controlled by the three speed slider switch in the dash.
The second is the ac evaporator blower motor controlled by the three speed rotary switch in the center shifter console.

So to be clear which switch are you turning on and at what speed 1,2 or 3 does the fuse blow. Each blower motor is on a separate circuit from each other.