How does an expansion tank work?
1. As the engine starts, the coolant is pumped through the engine block and cylinder head to absorb heat.
2. The coolant absorbs heat and expands in volume as the engine reaches its operating temperature.
3. The excess coolant flows into the expansion tank through a hose connected to the radiator.
4. The expansion tank provides additional space for the expanded coolant to occupy without causing excessive pressure buildup in the cooling system.
5. When the engine cools down, the coolant contracts, and it flows back into the cooling system from the expansion tank.
Features of an expansion tank:
- Typically made of plastic to reduce weight and prevent corrosion.
- Includes a cap with a pressure release valve to regulate pressure in the cooling system.
- Some vehicles have sensors in the expansion tank to monitor coolant level or temperature.
The expansion tank is an essential part of the engine cooling system, as it maintains the proper coolant level, prevents overheating, and helps ensure the reliability and longevity of the engine.
