What does the exclamation mark inside a circle on the fuel gauge indicate?

[SanGiselle]

The exclamation mark inside a circle on the fuel gauge indicates a lack of coolant. Precautions for adding coolant: 1. Water quality requirements: Water can be divided into hard water and soft water based on whether it contains dissolved minerals. Hard water contains ions such as iron, calcium, and magnesium. Untreated well water or spring water is considered hard water. If this type of hard water is added to the engine, it will produce compounds like calcium carbonate and calcium sulfate after being heated and evaporated by the engine, which will precipitate and form scale. Scale, on one hand, is a poor conductor of heat, and on the other hand, when it accumulates to a certain extent, it can narrow the pipes, reducing water flow and affecting engine cooling, leading to engine overheating. 2. Timely replacement: After adding long-life coolant to the engine, the radiator cap should be opened for inspection after a period of operation. When the radiator shows signs of water stains, rust, or sediment, the coolant should be replaced promptly.