How to disassemble the water pipe joint of Mazda 3 heater?

First, unscrew the left and right horn covers of the car, then unscrew the middle windshield, then take out the screws, then remove the two screws under the cigarette lighter, and then remove the screws in the sundries box. Then, you need to remove the switch on the front cover and the screws on both sides of the bar, and unplug the hose outside the heater tank.