From the what? Must be another car. On a W126, you remove the panel under the dash on the passenger side (3 screws buried in the fabric), then remove the bottom cover of the blower case (screws? clips? don't remember), then remove the blower (4 screws). There are two wires that connect to the blower. Mine have different terminals. Make sure yours do or mark them.
To remove the motor, remove the screw that holds the motor to the plastic bracket, fold in the terminals enough to let the motor slide out. The motor shaft is pressed into the fan. You can punch it out or get a replacement motor with fan.