If it is worn out or failing, the pump may not move fluid effectively. The water pump circulates engine coolant through the system to prevent overheating. Replacing a faulty sensor often resolves intermittent coolant light problems. If this sensor is defective, it can provide incorrect temperature readings and trigger the light prematurely or sporadically.Ī bad sensor that inaccurately reads hot then cold again will cause the warning indicator to cycle on and off even if actual coolant temperature is fine. The coolant sensor is responsible for measuring the current temperature of the fluid and signaling to your dashboard light to turn on when it gets too hot. In either case, enough loss of fluid will lead to the erratic coolant light. ![]() Internal leaks are less visible but allow coolant to mix with engine oil. These leaks leave obvious dripping on the ground. Both external and internal leaks will allow precious fluid to escape, reducing cooling capacity and turning on the temperature warning light.Įxternal leaks could originate from hoses, the reservoir, water pump, thermostat housing, radiator, or anywhere else in the cooling system. One of the primary ways coolant levels get low over time is from leaks in the system. Be sure to visually check the see-through reservoir while engine is cold and top off if needed. Topping off the reservoir to proper levels can temporarily turn off the light again, but if there is an underlying leak or consumption problem, the levels will continually drop and cause the indicator to cycle on and off. Low fluid levels lead to overheating, which then triggers the warning light on the dash. The most obvious and prevalent cause of coolant light activation in BMWs is running low on engine coolant in the reservoir. Here are the most common culrpits behind an inconsistent or erratic temperature warning light: 1. Common Reasons for BMW Coolant Light FluctuationsĪ BMW coolant indicator that blinks on and off is almost always caused by one of several issues. The on-off cycling suggests the overheating is sporadic rather than constant. So in summary, this warning light turning on informs the driver that the engine coolant is too hot and needs to be addressed promptly to avoid catastrophic failure.
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