Engine Cooling - INGENIUM I4 2.0L Petrol/INGENIUM I4 2.0L Petrol - PHEV (G2523631): Operation: Notes
Engine Coolant Circuit Flow Diagram
A = LOW TEMPERATURE COOLANT: B = HIGH TEMPERATURE COOLANT: C = COOLANT BLEED ROUTE.
| ITEM | DESCRIPTION |
|---|---|
| A | Cylinder head |
| B | Cylinder block |
| 1 | ATF cooler |
| 2 | ATF warming valve |
| 3 | Coolant expansion tank |
| 4 | Variable coolant pump |
| 5 | Charge air cooler |
| 6 | Charge air cooler coolant pump |
| 7 | Charge air radiator |
| 8 | Radiator |
| 9 | Auxiliary coolant pump |
| 10 | FFBH - If equipped |
| 11 | Heater core |
| 12 | Electric thermostat |
| 13 | Electric throttle |
| 14 | Engine oil cooler |
| 15 | Turbocharger |
| 16 | Engine coolant degas separator |
| 17 | Thermostatic valve |
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 through High Speed (HS) Controller Area Network (CAN) Human Machine Interface (HMI) systems bus with the BCM /GWM .
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.