Coolant Recovery System

Note: When the coolant thermostat is closed, there is no flow through the radiator coolant expansion tank. A pressurized radiator coolant expansion tank system is used which continuously separates the air from the cooling system.

^ When the coolant thermostat is open, coolant flows through the hose from the bottom of the coolant expansion tank into the radiator lower hose.
^ The coolant expansion tank separates any trapped air from the cooling system and replenishes the system through its coolant expansion tank hose attached to the water outlet hose.

The coolant expansion tank serves as the location for:
^ Service fill.
^ Coolant expansion during warm-up.
^ System pressurization from the coolant expansion tank cap.
^ Air separation during operation.
^ The coolant expansion tank is designed to have approximately 0.5 to 1 liter of air when cold to allow for coolant expansion.