On the car dashboard, C and H represent the water temperature. Blue indicates the water temperature is too low, red indicates it is too high, and when unlit, it means the temperature is normal. Under normal conditions, C on the dashboard represents 60 degrees, and H represents 110 degrees. The water temperature gradually increases from C to H. Reasons for high water temperature: Insufficient coolant: A coolant leak can reduce the coolant level, leading to a rise in water temperature. In this case, check for any coolant leaks. If there is a leak, repair the leaking component as soon as possible. If there is no leak, promptly add the appropriate coolant. Faulty cooling fan: A malfunctioning cooling fan can cause the water temperature to rise. When the vehicle is running at high speeds, the generated heat cannot be efficiently transferred to the coolant, affecting heat dissipation and causing the coolant temperature to rise. If this happens, reduce the speed while driving and check if the fan is malfunctioning. Reasons for low water temperature: Thermostat failure: If the thermostat fails and the valve does not close, the coolant will continuously circulate, potentially causing the engine's water temperature to drop too low. Some vehicles may even have the thermostat removed in summer to lower the temperature, which can also result in a very low engine water temperature. Abnormal operation of the radiator fan: If the cooling fan runs continuously due to wiring issues, it will slow down the warming efficiency of the engine and coolant, leading to a slow rise in water temperature and significantly increased fuel consumption.
