Where is the BMW B48 return water pipe located?
2 Answers
BMW B48 return water pipe is located between the outermost part of the external intake grille and the throttle body. Introduction to automotive return water pipe: An automotive return water pipe is a pipeline connected to the end of the hot water pipe and extended to the side of the hot water pipe, hence called a return water pipe. Function of automotive return water pipe: When a car is running, it generates heat which is cooled by water. There are many small interconnected holes in the cylinder block, and the radiator serves to store reserve water. When the water in the cylinder block reaches a certain temperature, the thermostat automatically opens, and the water pump circulates the reserve water into the cylinder block. At this time, the upper water pipe is needed to transport the reserve water to the cylinder block, and the cylinder block then sends it back to the radiator through the lower water pipe. The water pipe is like a road that transports a car from one place to another.
After opening the hood, the return hose is generally located at the front end of the B48 engine, near the fan and grille area. Specifically, it is part of the cooling system, connecting from the water pump to the thermostat or radiator to ensure coolant circulation. Leaks are common due to aging or vibration, and pink coolant drips may be visible on the engine bay floor when leaking. As someone who frequently repairs these vehicles, I recommend first checking if the hose connections are tight or cracked—regular maintenance can prevent engine overheating. If performing DIY repairs, remember to work only after the engine is turned off and cooled down. Using a phone flashlight makes it easier to locate the hose. While BMW OEM hoses are of good quality, ensure compatible replacement parts are used.
