How do I change the AC blower 1987 Mercedes Benz 420 sel?

To change the AC blower on a 1987 Mercedes-Benz 420 SEL, first disconnect the negative battery terminal for safety. Remove the passenger side under-dash panel to access the blower motor. Disconnect the electrical connector and remove the screws securing the blower motor in place, then take out the old motor and replace it with the new one, reassembling in reverse order. Finally, reconnect the battery and test the blower to ensure it's functioning properly.