Not changing antifreeze for a long time can cause overheating. Antifreeze replacement cycle: Vehicle antifreeze generally needs to be replaced every 2 years or 40,000 kilometers. This is just a reference cycle. For commercial vehicles with higher mileage, the replacement interval should be shorter. Since driving conditions vary for each vehicle, the replacement should be based on actual usage. Check the antifreeze condition regularly - replenish it promptly if the level is low, and replace it immediately if you notice suspended particles, sediment, discoloration, or deterioration, followed by system cleaning. Antifreeze replacement method: Before a complete antifreeze change, conduct a thorough inspection for leaks or cracks in all hoses, with special attention to the five-way pipe (named for its five connection points distributing antifreeze to different vehicle components). If leaks are found at this junction, replace the hose or reseal connections as needed. Drain the old antifreeze, then flush the channels with clean water. Fill the reservoir with water and let it circulate through the cooling system by idling the engine for 3-5 minutes. Initial discharge will appear light pink; continue flushing until the water runs clear. Remember to disconnect and drain the heater hoses. After approximately one hour of draining, add new antifreeze through the radiator hose for rapid filling. Then refill the reservoir until nearly full. Run the engine for about 10 minutes - as air escapes from the system, the fluid level will drop. Top up to the "MAXT" mark on the reservoir.
