What are the reasons for insufficient engine cooling system?
1 Answers
Reasons for insufficient engine cooling system: After replacing the water pump, the temperature control actuator-N493- was not matched; There is air in the radiator coolant system; The engine cooling system is dirty with excessive impurities; Incorrect use of sealant during water pump installation; Not using high-quality antifreeze with a proper freezing point. Air in the cooling system due to improper operation. This issue seems simple but is the most common mistake. Especially for the third-generation EA888 engine, which closes the cylinder block coolant passages during cold starts to quickly end the warm-up phase. Therefore, the requirements for coolant filling and bleeding are higher. It's best to strictly follow the vehicle maintenance manual and use necessary vacuum coolant filling equipment. Scale, rust, sludge, and other impurities in the engine cooling passages may stably adhere and accumulate in corners when not disassembled. However, during coolant replacement or water pump installation, these impurities can break loose and become visible on the inner walls of removed old components. These deposits can cause minor issues like the electronic thermostat's rotary valve sticking or triggering engine fault codes, or severe problems like new water pump seal wear, coolant leaks, radiator blockage, and engine overheating. Before replacing the water pump, thoroughly cleaning the radiator and cooling passages can prevent engine overheating and other faults. This improves radiator and cooling passage efficiency, saves energy, enhances the water pump's working environment, and reduces quality defects like leaks caused by poor passage conditions. Not using high-quality antifreeze with a high freezing point. If the antifreeze purity or performance is inadequate, its temperature rise curve won't match the engine's built-in program predictions, causing the EPC light to illuminate.
