BMW N47 EGR cooler failure — coolant leak into intake
BMW
3 Series
2010
Safe to Drive?
🚫 Do NOT Drive
Urgency Level
🔴 Fix Immediately
Coolant level dropping without visible external leaks. White smoke from the exhaust on start-up. The EGR cooler on the N47 engine cracks internally allowing coolant to enter the intake manifold and combustion chambers. If the coolant leak is severe, hydrolock and engine damage can occur. The EGR cooler and EGR valve should be replaced together. Fitting an uprated steel EGR cooler prevents recurrence.
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