Coolant Reservoir: Description and Operation
DESCRIPTIONTrapped air in the cooling system must be removed. A pressurized radiant coolant recovery reservoir system is used which continuously separates the air from the cooling system. The degas bottle separates any trapped air from the coolant and replenishes the system through its radiator coolant recovery hose.
OPERATION
When the water thermostat is closed, coolant flows through the degas tube and hose assembly from the lower intake manifold to the degas bottle.
- When the water thermostat is open, coolant flows through both the small hose from the top of the radiator outlet tank and the degas tube and hose assembly from the engine to the degas bottle.
DEGAS BOTTLE
The degas bottle serves as the location for:
- service fill.
- coolant expansion during warm-up.
- system pressurization from the pressure relief cap.
- air separation during operation.
- The degas bottle is designed to have approximately 0.5-1 liter (0.53-1.06 quarts) of air when cold to allow for coolant expansion.