By YOUCANIC on May 12, 2019
BMW engine coolant outlet fitting (BMW Part: 11537541992) may break or crack while the engine is running causing coolant loss (and engine overheating if ignored).
If you notice coolant leak from the thermostat to cylinder head coolant hose this is often the culprit.
The original outlet is made of plastic and is prone to failure. The part is found on many BMW models including the popular BMW 335i.
This part is found on N54, N53, N52 and N51 3.0-litre motors.
The best solution is to replace the plastic fitting with a metal part that will not leak and crack like the original.
Continue reading to learn how to replace BMW water hose fitting yourself with the upgraded part.
This is a recommended upgrade if you race your BMW or live in a city that frequently sees high temperatures.
We would recommend that you replace this part with the new aluminum design so that it will not fail like the original fitting did.
The other advantage of the aluminum design over the OEM part is that the aluminum fitting has a larger diameter which improves the coolant flow.
The fitting is mounted with two bolts and has a 1-inch diameter.
The hose connects the coolant thermostat housing hose at the front of the engine.
This guide applies to the following vehicles: