Coolant Expansion Tank
| ITEM | DESCRIPTION |
|---|---|
| 1 | Bleed screw |
| 2 | Hose connection - Engine coolant outlet |
| 3 | Hose connection - Radiator |
| 4 | Filler cap |
| 5 | Maximum and minimum level markings |
| 6 | Mounting lug |
| 7 | Hose connection - Engine coolant inlet |
| 8 | Engine coolant level sensor |
| 9 | Mounting lugs |
A pressurized coolant expansion tank system is used which continuously separates the air from the cooling system and replenishes the system through a hose connected between the coolant expansion tank and the variable coolant pump. A continuous vent into the coolant expansion tank, through a hose connected to the radiator, prevents air locks from forming in the cooling system.
The coolant expansion tank is attached to the front end carrier in the front left corner of the engine compartment. A filler cap, a bleed screw and an engine coolant level sensor are incorporated into the coolant expansion tank. Maximum and minimum level markings are molded into the exterior of the tank.
The coolant expansion tank provides the following functions:
- Service fill.
- Engine coolant expansion during warm-up.
- Air separation during operation.
- System pressurization by the filler cap.
The coolant expansion tank has an air space of approximately 0.5 to 1 liter (1.06 to 2.11 US pints), above the maximum level, to allow for engine coolant expansion.