00 00 ... Checking coolant level and concentration, correcting if necessary

WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Check connections, hose clamps and hoses for coolant residues and damage such as e.g. cracks.
Check coolant level in expansion tank. Coolant level must be between Min. and Max. markings. If necessary, top up coolant to max. fill level.
In event of topping up: Check concentration with antifreeze tester (special tool) in coolant expansion tank. If necessary, drain off the difference quantity at the coolant drain plug and top up with recommended coolant (issue a separate invoice).