BMW 17127578405 Water Hose (Expansion Tank to Radiator)

Description

This hose, 17127578405, is a genuine BMW OEM part described as a coolant/water hose connecting the expansion tank to the radiator (vent hose). ECS Tuning+2OEMBimmerParts+2
Key features/notes:

• Manufacturer listing: “Water Hose – Expansion Tank to Radiator (Vent Hose).” OEMBimmerParts

• Compatible with BMW models such as F10 528i (N52 3.0L) among others. ECS Tuning+1

• Aftermarket/alternative listings show the hose used for multiple BMW chassis (F10, F11, F01, F02) as part of the cooling system. Alibaba+1
  Usage & Importance:

• This hose is critical in the vehicle’s cooling system: it allows connection between the coolant expansion/overflow tank and the radiator, ensuring proper coolant flow, overflow and venting.

• Replacement is necessary if the hose shows signs of cracking, swelling, leaks, or if the cooling system is replaced/serviced.

• When listing for sale or stocking: verify side, orientation, and exact engine/chassis compatibility; highlight that it is OEM for BMW and covers cooling system route.

Compatibility / Fitment Notes:

• Brand: BMW

• Part Number: 17127578405

• Category: Water/Coolant Hose – Expansion Tank to Radiator (Vent Hose)

• Typical Fitment: BMW F10 (528i) N52 engine, and other BMW models in the F‑series (F10, F11, F01, F02) based on alternate listings. Alibaba+1

• Prior to ordering, verify the vehicle’s VIN, engine code, chassis code and ensure the hose routing matches your vehicle.

• Also note the listing may indicate “vent pipe/hose”—so clarify if this is the correct hose for the vehicle’s cooling/overflow system.