How Often Should the Coolant in a Manual Transmission Car Be Replaced?
2 Answers
For manual transmission cars that operate for extended periods, high-quality coolant should generally be replaced once a year. For those with shorter operating times, replacement can be done every two years or every 30,000 kilometers. To prevent excessive foaming, which reduces the heat exchange efficiency between the coolant and engine components, ensure the product is within its validity period when adding it. Long-life coolants can remain effective for up to three years. If suspended particles, sediment, or signs of deterioration or discoloration are observed in the coolant, it should be replaced promptly, and the system should be cleaned. How to Replace Coolant: Before completely replacing the coolant, conduct a thorough inspection to check for any signs of leakage or cracks in the pipes, with particular attention to the five-way hose. Coolant is distributed to different parts of the car after flowing through this hose. If there are any signs of coolant leakage in this section, replace the hose or reseal the connections as needed. Drain the old coolant, then flush the fluid channels with clean water. Add water to the coolant reservoir and continue filling it until water flows continuously through the engine cooling system. Start the engine and let it idle for 3 to 5 minutes to circulate the water. Initially, the water draining from the reservoir will appear slightly pinkish. Continue adding water until the outflow is clear. Remember to disconnect the heater hose and drain the water from the heater core. About an hour after draining, add new coolant through the radiator hose. Then, pour another container of coolant into the 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 coolant level will drop. Top up the coolant until it reaches the "MAXT" mark on the reservoir.
I've been driving for over 20 years, and changing antifreeze is something you shouldn't take lightly. It applies to manual transmission cars as well, typically needing replacement every two years or 30,000 kilometers. Having driven in both northern and southern regions, areas with extreme cold require annual checks, otherwise the cooling system can corrode and develop leaks. The key is to refer to the manufacturer's manual, as recommendations vary by vehicle. When it ages and turns darker or cloudy, it's best to have it professionally replaced at a repair shop to avoid mixing errors that could cause engine overheating. The engine is the heart of the car—this maintenance cost shouldn't be skimped on, and it helps extend the vehicle's lifespan with fewer issues.
