I have a 97 328i that gives a false "coolant level message" on the OBC.
This only occurs when I shut the engine off.
There are not leaks, the gauge operates at its normal position. When I start the car the system checks ok. It only occurs when I shut the engine off.
I've replaced the coolant level sensor twice. I've also check the problem with another OBC thinking that it was the OBC. It gave the same message.
I'm looking for suggestions??????
By the way, can a faulty radiator vent screw (plastic screw) cause this?