The water tank of the car heater is blocked. How can I unblock the video?

If the water tank of the car heater is blocked, it can be blown with high-pressure air. It is relatively simple to remove two tubes from the heater tube and blow them through the heater tank. The reasons for the blockage of the warm air tank are: 1, which may be that the engine water channel has been unclean, which will cause the blockage of the warm air tank; 2. If the antifreeze has been used and replaced at the specified time, this phenomenon will not occur; 3. The warm air box is a device that provides warm air for the air conditioner in winter, which uses the heat continuously circulated in the car by the temperature of engine cooling water to provide heating.