What to do if the evaporation box of the heater water tank is aging?

According to the query on the Autohome official website, the method is as follows.

1. Stop the vehicle and turn off the engine. After the coolant temperature drops, open the expansion bottle and add water tank cleaning agent.

2. Dry the water tank with compressed air and then add water to the water tank. When the temperature reaches above 90 degrees, turn off the car and open the water tank cover, add antifreeze and reach the standard liquid level.

3. Wait until the next morning to check whether it is normal. If not, go to the repair shop for repair.