Volkswagen Santana heater box exploded view, how to disassemble Santana heater box?

The disassembly method of Volkswagen Santana warm air water tank is as follows: (1) Drain the coolant from the cooling system. (2) Remove the control panel. (3) Separate the cable fixing piece on the left side of the heater and remove the screw on the terminal. (4) Pull out the wire connector behind the blower motor. (5) Disconnect the vacuum tube and lighting line behind the heater control device. (6) Place a container under the heater water supply pipe behind the engine and cylinder head. (7) Disconnect the heater water supply pipe behind the cylinder head.