Car running for a long time will inevitably produce waste gas and waste materials, so riders should pay attention to car maintenance at ordinary times to avoid water tanks and other parts being blocked by waste materials.
The heating box of the car is blocked. You can blow it with compressed air first to see if it can be unblocked. It is necessary to remove two pipes from the warm water pipe and blow them through the warm water tank. This method is simple, but it can only be used when the inside of the water tank is blocked by soft mud.