1. first, start the engine, use the fault diagnosis instrument or water temperature meter to observe whether the water temperature is too high, or if the pressure is not enough with the finger, if the water temperature is high, the pressure is insufficient to explain the lack of antifreeze night and further check the location of the leak proof liquid: full car water pipe, water tank, water pump, lower intake air cushion, warm air tank if it leaks. Leakage of antifreeze fluid; by checking the oil gauge, oil cover, if milky white, then dismantling the engine and checking the leak location.