Coolant Loss Due to Leak from Expansion Tank on BMW 528i

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 155,000 (120,000–180,000)
2 model years affected: 1999, 2000
7 people reported this problem
Viewing 1 - 3 of 3 comments
The impeller in the water pump is known to break or fall. This lead to the radiator and coolant reservoir to fail as well.
Problem just started car overheats the minute i get on highway but does not overheat as quick when slow speeds or idling. Believe it could be thermostste or bad radiator. Hoping its not the head gasket altough no other signs that that is my problem