00 00... Coolant hoses: visual inspection for leaks. Checking coolant level and concentration, topping up if necessary

Check connections, hose clamps and hoses for coolant residues and damage such as 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.

Check concentration with antifreeze tester in coolant expansion tank. If necessary, drain differential quantity from radiator drain plug and top up with recommended coolant. See COOLING SYSTEM - TECHNICAL DATA - 540I (E39) .