How to disassemble Dongfeng Shen Feng h30 heater box and how to replace Shen Feng h30 heater box?

Disassembly and assembly method of Dongfeng Shenfeng h30 heater water tank: (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 heating device and remove the screw on the wire terminal. (4) Pull out the wire connector behind the blower motor. (5) Remove the vacuum tube and lighting wire behind the heating control device. 6) Place a container under the engine and under the water supply pipe of the heater behind the cylinder head. (7) Remove the heater water supply pipe behind the cylinder head. (8) Remove the heater return hose on the thermostat housing, insert the pedal pump hose into the heater return pipe, pump the cooling water from the water supply pipe into the container, and blow out the residual cooling liquid in the heater. (9) Remove two connecting bolts, and then separate the oil return pipe. (10) Pull out the right air pipe under the heater oil return pipe. (1 1) Remove the two bolts on the other side and separate the water supply pipe on the flange joint. (12) Pull out the air pipe under the water supply pipe on the left side of the heater. (13) Remove the water supply pipe bracket on the left side of the firewall. (14) Loosen the mounting bracket nut under the water supply pipe bracket. (15) Loosen the right mounting bracket nut under the oil return pipe. (16) Remove the two mounting nuts at the top of the heater. (17) Remove the control line of the blower motor switch. (18) Remove the control line on the main damper on the heater side. (19) Separate the heating device from the mounting stud, then lift it up and remove it from the vehicle. (20) Install in the reverse order of disassembly. However, it should be noted that when connecting the blower control line, first connect the line to the switch, then move the switch to the "MAX" position, connect the control line end to the main damper arm, open the main damper to the top, and then locate the external cable; After all the work is completed, add coolant as needed.