This is the heater core box, which is directly behind the Center divider in the dash(in this car at least)
Inside this box contains the heater core.

After removing the A/C box from the heater core box you then remove the two bolts in the blue squares(engine compartment) and for reference marks the red box is coolant hose connections left goes to engine and right goes to radiator(might have mixed those two up) and the purple box is the throttle cable

This is the heater core and the motor part of the blower motor, both are being replaced, as the heater core Ruptured in the past and would not be fun to have rupture again.