1. Pry open the gap of the central control board of Beijing Hyundai Elantra with a flat screwdriver.
2. Unscrew the screw that fixes Beijing Hyundai Elantra CD player.
3. All the central control panels of Beijing Hyundai Elantra were removed.
4. Remove the water tank of Beijing Hyundai Elantra heater.
5. Put back the new heater water tank of Beijing Hyundai Elantra.
6. Install the central control board and CD player of Beijing Hyundai Elantra, and the operation is completed.