What does it mean when the blue water temperature light on the car dashboard is on?
2 Answers
When the blue water temperature light on the car dashboard is illuminated, it indicates that the water temperature is currently too low. If the light is blue right after starting the car, this is normal, and it will turn off once the car warms up. However, if the light remains blue continuously, it suggests a problem that requires inspection at a repair shop. The blue water temperature light signifies low water temperature; it will turn off after driving for a while or idling for some time as the temperature rises. Conversely, a red light indicates high water temperature, and the car should not be driven further. The blue or green water temperature indicator light on the dashboard is a normal low-temperature warning, indicating that the engine has just started and is in the warm-up phase. During this time, avoid aggressive driving to prevent severe engine wear due to low water temperature. The light will turn off once the water temperature reaches the optimal operating range for the engine.
When the blue water temperature light on the dashboard is on, it means the coolant temperature is too low and the engine hasn't warmed up yet. This is particularly common when starting the car in cold weather. I remember when I drove to the northern regions before, this light stayed on after starting the car in sub-zero temperatures, and the vehicle shook like it was falling apart when pulling away. This happens because when the coolant temperature is too low, the engine oil becomes too thick and can't lubricate properly, which can easily increase engine wear. It's recommended to drive slowly, maintain light throttle pressure without sudden acceleration, and wait until the coolant temperature rises to normal levels - the light usually turns green or goes off then. If this frequently occurs during short trips, it might indicate a faulty sensor or thermostat, and you should get it checked at a repair shop to avoid long-term engine damage. As a preventive measure, it's good practice to warm up the car for half a minute before driving off in the morning - being kind to your car is never a bad idea.
