Quote:
Originally Posted by AlphaBetaX5
Yes, and no!
Yes your Electric Coolant Pump is working. But that does not necessarily mean it is “fine“.
Here is how to test them:
Unlock your OBD menu.
Go to menu #7 to see engine coolant temperature.
Bring engine temperature to 100-105C
Allow engine to idle for 3-5 minuets
Once temperature reaches 108-110C, the thermostat will open, directing coolant to the radiator. E-fan will step in. And engine temperature will drop.
This happens in 2-3 minuets.
Engine temperature drops to below 100C.
Only then you can safely conclude that your thermostat and ECP are “fine”.
Note1: the given times are for a warm climate like Southern California. It may vary in your area.
Note2: Crack in expansion tank is a known issue. Replace it quickly.
Use approved coolant. It doesn’t have to be BMW. But it can worth your engine!
Find leaks and cure them before you get “engine overheated” message on your display.
Good luck
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thanks for the help, i'll have to search for a doc on accessing the hidden menu. Unfortunately there are no parts stores around with the expansion tank, and there are no dealers open in NC. so i guess on these, does it just vent through the cap?
i pulled the expansion tank out, that was a pain. Its a shame that the one connector for the bottom hose is not reversed. it makes getting to the clip for it a real, pain.