0000 Checking coolant level and concentration, correcting if necessary

WARNING: This page is about a different car, the 2018 BMW 340i, 2017 BMW 340i, and 2016 BMW 340i. 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 composition in expansion tank: Should be -35 °C to -40 °C.
Check coolant level in expansion tank. Coolant level must be between Min. and Max. marks. If necessary, top up coolant to max. fill level. If there is no coolant, also identify the cause and notify the customer.
During refill (for special allocation):
- If needed, drain coolant volume difference
- Top up prescribed coolant. Refer to RADIATOR - OPERATING FLUIDS .