What is the reason for the Audi A6 indicating insufficient coolant?

[LaKinsley]

Audi A6 is reminding that the engine needs to add coolant. Coolant: Also known as antifreeze, anti-freeze liquid, radiator fluid, etc. Its main function is to protect the normal and good operation of the engine, circulating in the engine radiator to prevent freezing, boiling, rust, and corrosion. Most antifreeze is red or green in color to observe whether there is leakage or to distinguish it from other engine liquids to avoid confusion. Audi A6: It is a luxury car produced by Audi, available in both sedan and station wagon models. The Audi A6 incorporates Audi's high-tech exclusive technology, further enriches the luxurious configuration, and gives it super strong sports characteristics. From design to performance, it reflects its perfect quality. Its characteristics are more luxurious, more dynamic, and more mature.