The heater blower motor is inside the black box. It is not visible until the dash comes apart. The two fans that you see under the passenger side are AC fans.
The heater blower motor is a do-able project, well written up. Even I was able to do it.
The most difficult part for me was disconnecting the two heater core hoses off the engine side of the firewall. 2nd mos difficult was splitting the heater box apart. Everything else is just small screw and small wrench work.
one thought- Replace the resistor. do it first and see if it solves the problem and if it does not, you'll want a new one in any way. When ours failed, we lost all the speeds except high. I don't know if they could fail completely and stop all fan speeds