Why does Audi frequently run low on coolant?

[PaisleyMarie]

There are several main reasons for excessive coolant consumption in vehicles: 1. Radiator damage or poor sealing of the upper and lower water chambers causing coolant leakage. 2. Loose connections at the overflow tank, water pump mating surfaces, or various coolant system pipe fittings leading to coolant leakage. 3. Apart from leakage issues, another possible cause is cylinder head gasket failure, excessive flatness deviation/warpage at the cylinder head and block mating surface, or loose cylinder head fasteners allowing high-temperature, high-pressure gases to enter the cooling system, resulting in rapid coolant consumption. Recommended solutions: 1. Regularly inspect all sealing points and connections, ensuring proper tightening where needed. 2. Never reuse sealing washers or tapes. These measures not only prevent excessive coolant consumption but also effectively avoid oil line leaks and transmission fluid leakage.