What are the reasons for BMW coolant leakage?
2 Answers
Reasons for BMW coolant leakage: 1. Cooling system sealing issue: Loose seals at the connection points between the coolant reservoir and radiator in the cooling system, leading to coolant leakage. 2. Pipe problems: Aging or cracked pipes causing coolant leakage. 3. Radiator issues: Corrosion in the radiator resulting in coolant leakage. Introduction to coolant: 1. The full name of coolant should be antifreeze coolant, meaning it has antifreeze functionality. Coolant prevents the freezing of the liquid in cold winter conditions, which could otherwise cause the radiator to burst or damage the engine cylinder block or head. 2. Coolant is a special additive-containing liquid primarily used in liquid-cooled engine cooling systems. It offers excellent performance in preventing freezing in winter, boiling in summer, and providing year-round protection against scale and corrosion.
My friend just fixed a coolant leak issue with his BMW, so here's some shared experience. The most common problem is aging and cracked plastic hose connectors, especially the three-way pipe behind the engine—plastic becomes brittle under high temperatures and leaks easily. Another frequent issue is water pump leakage, particularly the seal ring at the electronic water pump interface, which usually fails around 70,000-80,000 km, leaving pink coolant stains under the car. The auxiliary coolant reservoir cracking is also common, as plastic parts become brittle and start leaking over time. The most troublesome issue is a blown head gasket, where coolant mixes with engine oil, turning it into a milky substance—this will definitely trigger the dashboard coolant temperature warning. Remember, if you notice the temperature gauge rising, don’t push the car—call a tow truck immediately, or you’ll face a costly engine overhaul.
