What are the reasons for the BMW 525 indicating a lack of coolant?

[DelJames]

BMW 525 indicating a lack of coolant can be caused by insufficient coolant, a damaged coolant reservoir, or deteriorated vehicle coolant, among other reasons. Insufficient coolant: Check the actual coolant level to see if it is low. If the coolant is insufficient, there may be a leak in the cooling system. For example, there could be a leak in the pipes or radiator, which requires timely inspection at a repair facility to identify the exact leak point. If the leak is not visible to the naked eye, professional pressure testing is needed. Damaged coolant reservoir: The coolant level in the reservoir may be at the upper limit, but the vehicle dashboard still prompts to add coolant. This situation is relatively common in the BMW 525, where the float of the coolant level sensor is stuck. Replacing the coolant reservoir can resolve the issue. Deteriorated vehicle coolant: Vehicle coolant can naturally deplete and deteriorate over time, so it is necessary to regularly add and replace the coolant. When confirming a lack of coolant, ensure to add it when the engine is cold, taking care to prevent burns for safety.