Three options:
1. New mechanic
2. New vehicle
3. New wife
Pick one.
But seriously, make sure the vent settings are correct as well.
It took me for ever to find these in the iDrive, but they are also just above the heated seat buttons as well. If someone hits the vent control instead of the heated seats this can cause problems.
Also make sure the vent setting temperature as well as position is correct.
This is one of the crazy things that iDrive way over complicates.
As for antifreeze/coolant level checks, I think they need to be performed at 68F ambient otherwise the coolant contacts too much and you may set the level too high at say 32F ambient.
I also know things like washer fluid and coolant level get confused.
The icon pops in the dash, but the description pops up on the bottom of the iDrive display.