00 00... Checking Coolant Level And Concentration, Correcting If Necessary

WARNING: This page is about a different car, the 2010 BMW M5, 2009 BMW M5, 2008 BMW M5, 2007 BMW M5, and 2006 BMW M5. 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).