1. Remove the wiper blade and the cover plate of the gutter. Three bolts in the water storage tank fix the workbench, all of which can be removed.
2. Remove the heating water pipe connector and fixing cover plate connected to the heating water tank.
3. Remove the two bolts at both ends of the internal workbench, and then remove the fuse box guard, steering wheel guard, instrument panel and housing in turn.
4. Remove the two bolts at both ends of the internal workbench, and then remove the fuse box cover, steering wheel cover, instrument panel and housing in turn.
5. Remove the headlight switch and wiper switch, and remove the steering wheel fixing wire and two screws for fixing the workbench.
6. Remove the wire harness fixing wire on the bellows assembly, unplug the plug that gets in the way, remove the three fixing wires on the bellows assembly, and gently shake it to the left to take out the heating mechanism assembly.
7. Remove the old heating box and replace it with a new one.