Description

Water Pipe Connector / Coolant Outlet Pipe (Engine Block to Upper Radiator Hose) – BMW

OEM / Part Number: 11118511205 (BMW format: 11 11 8 511 205)

The BMW 11118511205 is a coolant outlet pipe / water pipe connector that mounts at the engine block and connects coolant flow toward the upper radiator hose. It’s a critical cooling-system junction piece designed to maintain proper coolant routing and sealing under heat and pressure.

What it does (Function)

• Routes coolant from the engine block outlet to the upper radiator hose circuit

• Maintains coolant flow integrity and helps prevent leaks at a high-stress connection point

• Ensures stable operating temperature by preventing coolant loss/air ingress

Key features & benefits

• Direct replacement for BMW OEM specification (correct geometry and connection points)

• Commonly supplied as the plastic coolant outlet pipe assembly for the application (OEM design)

• Many listings note a new gasket/seal included for proper reseal during replacement (confirm per supplier/brand)

• Helps restore cooling-system reliability where older connectors become brittle/age-affected

Symptoms of a failing connector (When to replace)

• Visible coolant seepage/leak around the outlet/connector area

• Coolant smell, low coolant warnings, or frequent top-ups

• Overheating or temperature fluctuations (especially under load)

• Cracking/brittleness at the connector or flange (common on aging plastic cooling parts)

Vehicle fitment (Applications)

This part is widely cataloged for BMW models using B46/B48-family configurations in multiple chassis. Examples commonly listed include:

• BMW F30 / F31 / F34 (3 Series variants)

• BMW F32 / F33 / F36 (4 Series variants)

• BMW G12 (7 Series variants shown in aftermarket fitment lists)

• BMW F48 / F39 / G30 / G01 / G02 are also frequently referenced for the same part number in catalogs

About your requested chassis list (F30 / F35 / G12 / F49):

• F30 and G12 are commonly associated with 11118511205 in multiple catalogs.

• F35 and F49 can be market/engine dependent. The safest professional practice is to confirm by VIN / engine code (B46/B48) before sale to avoid mismatch.

Specifications (Professional listing data)

• Part name (common): Coolant Outlet Pipe / Water Pipe Connector / Engine Block Connector Pipe

• OEM number: 11118511205 / 11 11 8 511 205

• System: Engine Cooling System

• Placement: Engine block coolant outlet → upper radiator hose circuit

• Brand options:

  • Genuine BMW (OEM)

  • Aftermarket equivalents (some suppliers offer upgraded aluminum versions to address plastic brittleness)