What does it mean when the BMW 3 Series suddenly prompts to add coolant?

[McElle]

When the BMW 3 Series suddenly prompts to add coolant, you should replenish the coolant promptly. Coolant, short for antifreeze coolant, refers to a cooling liquid with antifreeze properties. It prevents the coolant from freezing and potentially cracking the radiator or damaging the engine cylinder block during cold weather when the vehicle is parked. Coolant is not just for winter use; it should be used year-round. As part of regular vehicle maintenance, the engine coolant should be replaced every year. More details about coolant are as follows: 1. Composition and Classification: Coolant consists of water, antifreeze, and additives. Based on the antifreeze component, it can be classified into alcohol-based, glycerin-based, and ethylene glycol-based coolants. 2. Function: Proper use of coolant helps prevent corrosion, cavitation leakage, radiator overheating, scale formation, and freezing. It ensures the cooling system operates at its optimal condition, maintaining the engine's normal working temperature. Neglecting proper coolant usage can severely affect the engine's performance and lifespan. Therefore, it is crucial to use coolant consistently throughout the year.