Engine Coolant Circuit Flow
Schematic Diagram - Coolant Flow - Vehicles With Ingenium 2.0L Diesel 180PS Engine
A = LOW TEMPERATURE COOLANT: B = LOW PRESSURE COOLANT: C = HIGH TEMPERATURE COOLANT: D = HIGH PRESSURE COOLANT.
| ITEM | DESCRIPTION |
|---|---|
| 1 | Engine oil cooler |
| 2 | HP EGR cooler (if equipped) |
| 3 | Electric thermostat |
| 4 | Bypass PR valve - Electric thermostat |
| 5 | Radiator bias sleeve valve - Electric thermostat |
| 6 | Main valve - Electric thermostat |
| 7 | Block stagnant flow valve - Electric thermostat |
| 8 | Cylinder head |
| 9 | Cylinder block |
| 10 | Engine Coolant Temperature (ECT) sensor |
| 11 | Bleed screw (quantity 2) |
| 12 | Charge air radiator |
| 13 | Charge air coolant pump |
| 14 | Fuel cooler (if equipped) |
| 15 | Charge air cooler |
| 16 | Radiator |
| 17 | Radiator outlet temperature sensor |
| 18 | ATF cooler |
| 19 | Coolant expansion tank |
| 20 | Restrictor (quantity 2) |
| 21 | Heater core |
| 22 | Variable coolant pump |
| 23 | LP EGR cooler (if equipped) |
| 24 | FFBH (if equipped) |
| 25 | Auxiliary coolant pump (if equipped) |
| 26 | FFBH coolant changeover valve (if equipped) |
| 27 | HP EGR valve |
Schematic Diagram - Coolant Flow - Vehicles With Ingenium 2.0L Diesel 240PS Engine
A = LOW TEMPERATURE COOLANT: B = LOW PRESSURE COOLANT: C = HIGH TEMPERATURE COOLANT: D = HIGH PRESSURE COOLANT.
| ITEM | DESCRIPTION |
|---|---|
| 1 | LP turbocharger |
| 2 | Engine oil cooler |
| 3 | HP EGR cooler (if equipped) |
| 4 | Electric thermostat |
| 5 | Bypass PR valve - Electric thermostat |
| 6 | Radiator bias sleeve valve - Electric thermostat |
| 7 | Main valve - Electric thermostat |
| 8 | Block stagnant flow valve - Electric thermostat |
| 9 | Cylinder head |
| 10 | Cylinder block |
| 11 | Engine Coolant Temperature (ECT) sensor |
| 12 | Bleed screw (quantity 2) |
| 13 | Charge air radiator |
| 14 | Charge air coolant pump |
| 15 | Fuel cooler |
| 16 | Charge air cooler |
| 17 | Auxiliary radiator (if equipped) |
| 18 | Radiator |
| 19 | Radiator outlet temperature sensor |
| 20 | ATF cooler |
| 21 | Coolant expansion tank |
| 22 | Restrictor (quantity 2) |
| 23 | Heater core |
| 24 | Variable coolant pump |
| 25 | LP EGR cooler |
| 26 | FFBH (if equipped) |
| 27 | Auxiliary coolant pump (if equipped) |
| 28 | FFBH coolant changeover valve (if equipped) |
| 29 | HP EGR valve |
When the engine is running, the engine coolant is circulated around 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 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) comfort 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 and the ATF cooler 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 an air space in the coolant expansion tank and the compliance of the flexible hoses.