What are the reasons for the car radiator not circulating water?

[OPatrick]

The reason for the car radiator not circulating water is a blocked water pipe. The method to check for a blocked water pipe is: 1. Fill the radiator with water, cover the radiator cap, and start the engine; 2. Clamp the radiator hose and press the accelerator; 3. When the engine speed increases, if the hose shows suction and collapse, it proves the radiator is functioning normally; if not, it indicates a blockage. Precautions for car radiator water circulation: 1. When the engine's water temperature is high, the water inside the water pump circulates repeatedly to lower the engine's temperature. In winter, when the water temperature is low, the water circulation should be stopped to prevent the engine temperature from becoming too low; 2. When the engine coolant in the radiator boils at high temperature, the vaporization and expansion cause the pressure to exceed the set value, leading to overflow from the radiator cap for pressure relief, which can result in reduced coolant and burst pipes in the cooling system.