1. Drain the coolant from the cooling system of Tiggo heating box in 12, and remove the control panel.
2. Separate the cable holder on the left side of the heater and remove the screw on the terminal.
3. Unplug the wire connector behind the blower motor and disconnect the vacuum tube and lighting wire behind the heater control device.
4. Put a container under the engine and the heater water supply pipe behind the cylinder head.
5. Remove the water supply pipe of the rear heater of the cylinder head and the gas storage tank for replacement.