Does Car Antifreeze Have an Expiration Date?

[DiDelilah]

Car antifreeze does have an expiration date, typically around two years; long-life antifreeze can last up to three years. When adding antifreeze, ensure the product is within its validity period. If suspended particles, sediment, or signs of deterioration or discoloration are observed in the antifreeze, it should be replaced promptly, and the system should be cleaned. The method for replacing antifreeze is as follows: Before completely replacing the antifreeze, conduct a thorough inspection to check for any signs of leakage or cracks in the pipes, with particular attention to the five-way water pipe. Antifreeze flows through the five-way pipe before being distributed to different parts of the car to function. If there is any antifreeze leakage in this section, replace the water pipe or resecure the connection as needed. Drain the old antifreeze, then flush the fluid channels with clean water. Add clean water to the antifreeze reservoir and continue filling it until water flows continuously through the engine cooling system. Then, start the engine and let it idle for 3 to 5 minutes to circulate the water. Initially, the water draining from the reservoir will have a faint pink tint. Keep adding clean water until the drained water runs clear. Remember to disconnect the heater hose and drain the water from the heater core. After draining for about an hour, add the new antifreeze through the radiator hose. Then, pour another bottle of antifreeze into the antifreeze reservoir until it is nearly full. Start the engine and let it run for about 10 minutes. As some air is expelled from the cooling system, the fluid level will drop. Top up the antifreeze until it reaches the "MAXT" mark on the reservoir.