How to change antifreeze for Chevrolet Lefeng car

You don't need to put down the valve. The pipe joint connecting the water tank is disconnected with a movable steel ring. You take it off with movable pliers, then fill it with water from the coolant replenishment tank and air dry it with an air gun. If there is water rust, it is best to get some washing powder to wash it repeatedly until the water is clear, then connect the nozzle and add it from the water tank cover. This process needs to keep pinching the pipe by hand, because the liquid level you see should be full, then fill the refill tank, then start the engine, stop and refill until it is filled stably.