Report: Coolant Loss Due to Leak from Expansion Tank
BMW 323i Problem
Model Year Affected: 2000
An engine coolant leak may develop from the expansion tank resulting in engine overheating. When a cooling system component fails the entire cooling system should be inspected. It is not uncommon to find additional component have failed or are leaking.
Overheating can cause severe engine damage. If the engine begins to overheat it is recommended to stop at the first available location and have your vehicle towed to a repair shop.
Visitor, 2000 BMW 323i, 80,000 mi
I had this problem too, see: engine overheating, my expansion tank was cracked due to overheating and was where the coolant was leaking from...