Engine Cooling - INGENIUM I6 3.0L Petrol (G2523579): Operation: Notes
Engine Coolant Circuit Flow Diagram
A = COLD COOLANT: B = HOT COOLANT BLEED ROUTE: C = COOLANT BLEED ROUTE.
| ITEM | DESCRIPTION |
|---|---|
| A | Cylinder head inlet rail |
| B | Cylinder 1 at the front of the engine |
| C | Cylinder head outlet rail |
| D | Cylinder block outlet |
| 1 | ATF cooler |
| 2 | ATF warming valve |
| 3 | Coolant expansion tank |
| 4 | Electric thermostat |
| 5 | Auxiliary radiator |
| 6 | Radiator |
| 7 | Charge air cooler radiator |
| 8 | Charge air coolant pump |
| 9 | Charge air cooler |
| 10 | Electric throttle |
| 11 | Electric supercharger |
| 12 | Electric supercharger bypass valve |
| 13 | FFBH |
| 14 | Auxiliary coolant pump |
| 15 | Turbocharger |
| 16 | Heater core |
| 17 | Engine oil cooler |
| 18 | Variable coolant pump |
When the engine is running, the engine coolant is circulated in the engine cooling system by the variable coolant pump.
At engine start-up the variable coolant pump shroud is in a closed position, blocking the engine coolant flow in the cylinder block. When required, the HVAC Control Module (HVAC) can request the opening of the variable coolant pump shroud to provide the required engine coolant flow. The HVAC communicates with the BCM /GWM through High Speed (HS) Controller Area Network (CAN) Human Machine Interface (HMI) systems bus.
When the engine coolant is cold, the electric thermostat is closed and the engine coolant flows directly back to the variable coolant pump.
When the engine coolant reaches operating temperature the electric thermostat begins to open. This allows engine coolant flow through the radiator system to provide the required engine cooling.
When the electric thermostat is fully open, the majority of the engine coolant is passed through the radiator to the variable coolant pump. With a proportion still passing through the turbocharger, heater core, electric throttle and oil cooler.
Expansion and contraction of the engine coolant is accommodated by the space in the coolant expansion tank and the compliance of the flexible hoses.