What Causes the Water Temperature Warning Light to Flash?

[VonJustin]

When the car's water temperature light flashes, it indicates a malfunction in the engine cooling system. Here are the specific reasons for the water temperature light flashing: 1. Abnormal water temperature. Both excessively high or low water temperatures can trigger the water temperature light to flash. This may be caused by a faulty thermostat in the engine cooling system leading to overheating. A malfunctioning thermostat fails to open, obstructing coolant circulation within the engine and causing the coolant temperature to rise excessively, which activates the warning light. 2. Low coolant level will cause the water temperature light to flash. In this case, you need to replenish the coolant (antifreeze). Insufficient antifreeze in the engine cooling system may indicate leakage points such as water pump leaks, damaged pipes, or radiator damage. 3. Sensor failure. If the light continues flashing after adding coolant, it can generally be confirmed as a sensor malfunction.