Why does the water temperature light come on and then go off after driving for a while?
2 Answers
The reason why the water temperature light comes on and then goes off after driving for a while is: After the vehicle completes the self-check, the ECU signal is interrupted. However, for safety reasons, it is still recommended to first check whether the antifreeze is insufficient. If the antifreeze in the radiator is low, it should be immediately topped up to the normal level. When the vehicle's water temperature is abnormal, the water temperature warning light on the car dashboard will illuminate. At this time, it is recommended not to continue driving. Instead, you should stop to check, but do not turn off the engine. Let the engine continue to run at idle speed, and open the hood to dissipate heat. If you see steam coming from the hood, observe first and do not open it rashly to avoid burns.
I've been driving for over a decade, and it's quite common for the coolant temperature warning light to come on and then go off after driving for a while. This is usually due to insufficient coolant or a stuck thermostat. During cold starts, the engine temperature rises quickly, and the sensor may mistakenly think it's overheating, triggering the warning light. However, once the car is moving and the coolant circulates properly or the thermostat opens, the temperature stabilizes and the light goes off. While this isn't a major issue, it's important to take it seriously because ignoring it could lead to engine overheating, potentially damaging the head gasket or radiator. It's recommended to stop the car immediately and check the coolant level to ensure it's between the MIN and MAX marks. If it's low, top it up with the same type of coolant or distilled water. Additionally, feel the engine hood; if it's too hot to touch, it indicates a genuine high temperature that requires professional inspection. Regular maintenance, including coolant replacement and checking the thermostat and water pump, can help prevent such issues.
