6. Filling coolant: Close the water drain valve of the cooling system and start filling new coolant. According to the vehicle manufacturer's suggestion, use appropriate coolant, and ensure that the amount and proportion of coolant meet the requirements.
7. Degassing and pressure test: Start the engine and let it run for a period of time so that the coolant can circulate. In this process, you can open the bleeder valve of the cooling system to eliminate bubbles in the system. Then carry out the pressure test of the cooling system to ensure that the system pressure is normal.
8. Inspection and cleaning: Check the connection point between the return pipe and the cooling system to ensure that there is no leakage. Clean up the work area to ensure that there are no tools or materials left behind.
It should be noted that replacing the return pipe of automobile cooling system may require some professional tools and techniques, so it is recommended to seek the help of professional automobile maintenance technicians. With professional knowledge and experience, they can perform replacement operation more accurately and ensure the normal operation of the cooling system.
