Engine Cooling - INGENIUM I6 3.0L Petrol (G2341927): Operation: Notes
Engine Coolant Circuit Flow Diagram
H = HOT COOLANT: I = HOT COOLANT BLEED ROUTE: J = HIGH PRESSURE COOLANT FROM PUMP: K = LOW PRESSURE COLD COOLANT RETURN TO PUMP: L = HOT COOLANT RETURN: M = LOW PRESSURE COLD COOLANT RETURN AND 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 |
| E | Engine Coolant Temperature (ECT) sensor - Cylinder block outlet |
| F | Radiator outlet temperature sensor |
| 1 | Variable coolant pump |
| 2 | Electric thermostat |
| 3 | Coolant expansion tank |
| 4 | Auxiliary coolant pump |
| 5 | Heater core |
| 6 | Turbocharger |
| 7 | Electric throttle |
| 8 | Engine oil cooler |
| 9 | Radiator |
| 10 | Automatic Transmission Fluid (ATF) cooler |
| 11 | ATF warming valve |
| 12 | Right charge air radiator |
| 13 | Left charge air radiator |
| 14 | Powertrain Control Module (PCM) |
| 15 | Electric supercharger |
| 16 | Electric supercharger bypass valve |
| 17 | Charge air cooler |
| 18 | ATF cooler thermostatic valve |
| 19 | Charge air cooler coolant pump |
When the engine is running, the variable coolant pump circulates the engine coolant through the engine cooling system.
At engine start up, the shroud of the variable coolant pump is partially shrouded. The variable coolant pump limits coolant flow in the engine cooling system. When required, the HVAC control module (HVAC) can request the variable coolant pump shroud to open to provide additional flow of the engine coolant.
When the engine coolant is cold, the electric thermostat is closed. This forces coolant through the bypass route back to the variable coolant pump.
When the engine coolant reaches operating temperature, the electric thermostat begins to open. The engine coolant flows through both the bypass route and radiator system to provide the required engine cooling.
When the electric thermostat is fully open, the majority of the engine coolant is directed through the radiator and the Automatic Transmission Fluid (ATF) cooler.
Expansion and contraction of the engine coolant is accommodated by an air space in the coolant expansion tank and the compliance of the flexible hoses.