[Working principle of the lower water pipe connecting the car radiator]:
The upper water pipe of the car radiator connects the engine and the water tank, and circulates the coolant to the engine through the water pump, absorbs the heat generated by the engine, and maintains the normal operating temperature of the engine.
[Maintenance method]:
1. Regular inspection: Regularly check whether there is water leakage at the connection of the water pipe, find problems in time and deal with them.
2. Cleaning and maintenance: Clean the surface of the water pipe regularly to avoid dust and dirt accumulation.
