The chemical composition of the original coolant may change during long-term use, such as pH imbalance, preservative consumption, etc. If the new and old coolants are directly mixed, it may cause undesirable chemical reactions, generate sediments or harmful substances, which will accelerate the corrosion and blockage of the cooling system. Draining the original coolant and replacing it with new coolant can avoid this potential risk and keep the cooling system clean and effective.
Improve heat dissipation efficiency
Coolant is an important medium for engine heat dissipation. Over time, impurities and dirt in the original coolant will gradually accumulate. These impurities will adhere to the pipes, radiators, water pumps and other components of the cooling system, forming a barrier that hinders heat transfer. Draining the original coolant and replacing it with new liquid can remove these impurities and dirt, restore the heat dissipation efficiency of the cooling system, and ensure that the engine runs within a good temperature range.
Ensure the normal operation of the car water pump
The water pump is one of the core components of the cooling system, responsible for promoting the circulation of coolant in the system. If there are a lot of impurities and air inside or around the water pump, it will affect its normal operation and even cause damage to the car water pump. Draining the original fluid and replacing it with new fluid can ensure that the car's water pump is filled with pure coolant, reduce friction and wear caused by impurities and air, and extend the service life of the water pump.
Follow the vehicle manufacturer's recommendations
When designing and producing cars, vehicle manufacturers will formulate the coolant replacement cycle and replacement method based on the specific requirements and specifications of the vehicle. Draining the original fluid and replacing it with new fluid is one of the important steps to follow the vehicle manufacturer's recommendations. Doing so will not only ensure the normal operation of the cooling system, but also avoid vehicle warranty issues caused by improper operation.