BMW F30 330i Coolant Hose-Cylinder Head to Expansion Tank OEM 17129845173

This BMW F30 330i coolant hose connects the cylinder head to the expansion tank. It uses OEM part number 17129845173 for reliable fit and correct cooling system function. If your current hose is leaking, swollen, brittle, or cracked, replace it to protect engine temperature control.

Engine coolant hoses fail in predictable ways, and this connection point is a common area for leaks. When coolant escapes, the engine can run low on fluid. That reduces heat transfer and raises the risk of overheating. Short trips, hot weather, and normal vibration can all speed up wear and cause seepage around hose ends or clamps.

Replacing a worn coolant hose also helps you avoid the expensive damage that follows overheating. Low coolant levels can lead to warped components, blown gaskets, and accelerated wear on the cooling system. Even small drips can turn into bigger problems over time, especially if you continue driving without addressing the source.

This OEM-style cylinder head to expansion tank hose helps restore proper coolant flow. It supports stable coolant pressure and circulation, which helps the engine maintain safe operating temperatures. You get a durable hose designed for the BMW cooling circuit, so you can get back to confident daily driving.

1. Restores coolant circulation: Helps maintain steady engine temperature by returning proper flow between the cylinder head and expansion tank.
2. Prevents coolant loss and overheating: Fixes common leaks from cracked or brittle hose sections before temperature problems start.
3. Supports OEM-quality fit: Designed to match the BMW F30 330i cooling system layout for straightforward replacement.

Choose this BMW F30 330i coolant hose replacement when you notice moisture around the cylinder head area, a drop in coolant level, or a brittle hose that looks ready to split. A simple hose replacement can save your engine from more severe cooling system repairs.

Cross Reference: 17129845173, 17128677244, 17128740118, 17125A05950