E46 M54 Coolant Hose (Top)

Carries coolant from thermostat housing, comes with bleeder screw

Your E46's upper radiator hose carries cool coolant from the radiator back to the engine via the thermostat. As with all rubber hoses this upper radiator hose can swell and crack. If you notice unusual bulging we recommend replacing immediately before you suffer a catastrophic cooling system failure. While you're at it we also recommend replacing the lower radiator hose at the same time for best system service life.