2016-2025 BMW X1/X2 Coolant Vent Tube / Hose / Line 11158654626

The used OEM BMW coolant vent tube, OEM number 8654626, is the genuine hose that routes coolant from the engine's vent port. Also known as the coolant vent line, it replaces earlier numbers 7536521 and 11158654626. This tube serves the 2.0L turbocharged four-cylinder in the X1 and X2, relieving air pockets from the cooling system. When it fails, the most common symptom is a coolant leak near the engine's upper front, often accompanied by a low-coolant warning or visible dripping. Replacing a cracked or brittle vent tube restores proper coolant circulation and prevents overheating.