Leaking water pump, thermostat housing, or radiator – These major components have coolant running through them and seals that can wear out over time, causing leaks.Over years of heat/cold cycles and corrosion, they can become brittle and develop cracks that leak fluid. Worn or cracked plastic coolant system components – Many critical cooling system parts like the expansion tank, radiator, coolant hoses, and water pump impeller are made of plastic in BMWs.Here are some of the most common causes of coolant leaks in BMW models: What Causes Coolant Leaks in BMWs?Ĭoolant leaks can happen to any car, but BMWs tend to be more prone due to their complex cooling systems and amount of plastic components under the hood. This guide will also help you make smart decisions to catch any leaks early and avoid expensive engine damage down the road. Let’s dive in and explore the critical topic of BMW coolant leak repair costs so you know what to expect if your car starts showing symptoms of a leak. Average repair cost for different leak locations.The most common causes of BMW coolant leaks.In this comprehensive guide, we’ll cover: That’s why it’s critical to repair any coolant leaks right away. Low coolant levels or leaks can cause your BMW engine to overheat, leading to serious and expensive damage. When you have a leak in the coolant system, it allows this vital fluid to escape. It absorbs excess heat and gets pumped through the radiator to be cooled. The exact cost depends on the leak location and parts needing replacement.Ĭoolant (also called antifreeze) is a mixture of water and coolant fluid that circulates through your BMW’s engine and keeps it from overheating. But how much will it cost to repair a coolant leak in a BMW? Repair costs can range from a couple hundred dollars for minor external leaks, up to $1000+ for bigger jobs like a leaking water pump or radiator replacement. Is your BMW overheating? Do you see steam coming from under the hood or puddles of neon green fluid under your car? You likely have a coolant leak.

Car radiator leak repair cost