You can blow it with compressed air to see if it can be smoothed. Two pipes need to be removed from the heater water pipe and blown through the heater tank. This method is relatively simple, but it can only be used when the inside of the water tank is blocked by softened sludge. Cars inevitably produce exhaust gas when running for a long time, so car owners should pay attention to car maintenance to avoid water tanks and other parts being blocked by waste. In addition, a relatively simple way to solve the problem of blockage of the heater water tank is to find a washing station, then ask a repairman to remove the inlet and outlet pipes of the heater water tank, and then use the car wash water gun to flush it back and forth until the washed water becomes clear.