Look under the dash and also in front under the 'hood' to see what's the best way to access the plenum, the big black box that contains the fan, A/C evaporator, and the heater core. If you can get to the wires at the fan motor, I'd try directly applying 12v to it with jumper cables to be sure the motor is bad before removing it. I'd first check for a ground connection and see if in the fuse and relay box under the hood there is a relay for the fan. The fan speeds are controlled by a 'resistor pack' that has large resistance coils poked into the air flow of the fan inside the plenum. It usually has a multi-wire plug that is outside the plenum, either under the hood or perhaps under the dash. When it starts to fail, usually you lose some fan speeds in the dash fan control, defaulting to full fan speed, not dead. I'm sure you've checked the fuse for the fan before asking about accessing the fan.