3/28/2024 0 Comments Bmw low coolant light![]() ![]() Rubber radiator hoses also deteriorate after years of heat cycling.Ĭatching leaks from these components early is critical to avoid catastrophic overheating damage to the heads, block, and internal engine parts if the coolant level drops too low. This requires extensive engine repairs in most cases.Īs you can see, the most common culprits involve plastic components that degrade and fail over time from the high pressures and temperatures inside the cooling system. Cracked Engine BlockĪ worst case scenario is a crack or hole in the engine block allowing coolant to leak. Leaks occur if the housing cracks or the gasket fails. The thermostat housing bolts to the engine and contains a temperature-regulating thermostat valve. Coolant will leak into the passenger floorboard from a bad heater core. It’s prone to the same leakage issues from cracking and erosion. The heater core acts as a smaller radiator inside the HVAC system to provide heat. The constant high temperatures cause the hoses to degrade and develop cracks or pinhole leaks. The radiator hoses carry hot coolant to and from the engine. The tank may also leak where it connects to the radiator. Cracks in the tank or at the seam will lead to leaks. The plastic expansion tank holds the coolant and allows for expansion as the fluid heats up. Old plastic radiators can become brittle and prone to cracking over time. Cracks or damage to the plastic end tanks on the radiator will cause leaks. The radiator provides vital engine cooling by exchanging heat with the air. Catching a failed water pump early prevents overheating issues. The pump seal can wear out over time leading to leaks. This engine coolant pump circulates the coolant through the cooling system. One of the most common sources of coolant leaks is a bad water pump. The most common causes of BMW coolant leaks include: Failed Water Pump The cooling system is a sealed pressurized system, so when you have a leak, it allows coolant to escape. It absorbs heat and prevents freezing in cold temperatures. ![]() Let’s get started! What Causes Coolant Leaks in BMWs?Ĭoolant, also known as antifreeze, circulates through the engine block and components to keep your BMW’s engine at optimal temperature. taking it to a professionalĮquipped with this information, you’ll be able to confidently handle a coolant leak in your BMW and determine if it’s a quick fix you can knock out yourself or if it requires a trip to the repair shop.
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