BMW engine coolant outlet fitting (BMWPart: 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.
TIP! Note that BMW dealer may recommend that the thermostat hose needs to be replaced in order to fix this problem.
When purchased from the dealer the broken part may come as one part with the hose. We could not verify if BMW sells only the outlet fitting. This problem can be fixed by replacing the defective fitting and it is not necessary to replace the coolant. The hose should be replaced if it is leaking or damaged.