What is the method for replacing coolant?

[SanJohnny]

Replacing coolant involves the following steps: 1. Unscrew the radiator cap, open the radiator drain valve, and drain the antifreeze; 2. Flush the engine cooling system; 3. Add new antifreeze when the engine is cool, filling it up to the marked level on the radiator. The functions of coolant include: 1. Providing anti-corrosion protection for cooling system components; 2. Preventing scale formation to avoid reducing the radiator's heat dissipation efficiency; 3. Ensuring the engine operates within the normal temperature range. Precautions for using coolant: 1. Different types of antifreeze should not be mixed; 2. Do not open the radiator cap or drain valve immediately after driving; 3. When replacing coolant, ensure all old antifreeze is completely removed and the radiator is thoroughly cleaned.