Coolant Expansion Tank
| ITEM | DESCRIPTION |
|---|---|
| 1 | Filler cap |
| 2 | Mounting lug |
| 3 | Bleed screw |
| 4 | Mounting lugs |
| 5 | Engine coolant level sensor |
| 6 | Hose connection - Engine coolant outlet |
| 7 | Hose connection - Engine coolant inlet |
| 8 | Hose connection - Radiator inlet |
| 9 | Maximum and minimum level markings |
A pressurized coolant expansion tank system is used
- To continuously separates the air from the cooling system
- To 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.