Integral Coolant Expansion Tank
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
Remove radiator.
- Prepare approx. 2 liters of cleaning agent.
- Fill radiator and coolant expansion tank and shake well. Wait a few minutes until oil has separated.
- Drain radiator and coolant expansion tank.
- Reinstall cleaned radiator and if necessary coolant expansion tank.
- Fill entire cooling system (heating control to "warm") with hot water and thoroughly flush by changing water several times.
- Check drained flushing fluid for traces of oil. If necessary, repeat Procedure 5.
After cleaning procedure, top up coolant.