- Ensures that your radiator is always full, even when cold.
- Provides a way for hot fluid to expand without releasing fluid on the road.
- BMW expansion tanks should be inspected during routine maintenance.
An expansion tank helps maintain a minimal pressure increase during heated water expansion, helps reduce coolant hammer, and helps protect the engine cooling system from stress.
If you drive without the coolant cap for any length of time when the engine gets up to temp it will boil over out of the reservoir. You will lose at least half of the coolant in the system if you drive like that for a few days. Running the engine any longer than that may cause the engine to overheat.
| Specification | |
| Product Type | Spare Part |
| Comaptible with | BMW E46, X5 |
| Engine Capacity | 3 |
| Engine Cylinder Count | 4 |
| Weight | 0.98kg |
| Reference Code | 17137787040 |
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