COOLING FANS
The 2 radiator cooling fans are mounted in a twin fan and motor assembly between the radiator and the engine.
The fan control module controls the fans dependent on the demand from the cooling system (temperature) or the air conditioning system (pressure).
The fan control module is located on the twin fan and motor shroud. The variable PWM module controls the fan speeds.
Under hot operating conditions, the fans may continue to operate for some time after the engine has been switched off, but will stop automatically when the coolant temperature has been sufficiently reduced. Refer to Electronic Engine Controls article.
Scheme 61
| Item Number | Description |
|---|---|
| 1 | Engine block heater |
For vehicle markets subject to very cold climate conditions, an engine block heater for connection to an external mains power supply, is fitted in place of the engine block drain plug.
Scheme 62
| Item Number | Description |
|---|---|
| 1 | Engine oil cooler |
The engine oil cooler is a Median oil to water type. The oil cooler is located at the front of the engine and is fitted between the oil filter housing and the oil filter.
The coolant supply for the engine oil cooler is through the radiator bottom hose.
COOLANT RECOVERY SYSTEM
A pressurized coolant expansion tank system is used which continuously separates the air from the cooling system and replenishes the system through the coolant expansion tank outlet hose, attached to the heater return hose.
A continuous vent from the engine and radiator to the coolant expansion tank prevents air locks from forming in the cooling system.
Manual bleed points are provided on the coolant reservoir.
The coolant expansion tank serves as the location for
- Service fill
- Coolant expansion during warm-up
- Air separation during operation
- System pressurization by the coolant pressure cap
- The coolant expansion tank is designed to have approximately 0.5 to 1 liter of air when cold to allow for coolant expansion
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
The ECT sensor is located in the coolant outlet pipe and reacts to engine coolant temperature changes, providing an input to the ECM. The sensor is a Negative Temperature Coefficient (NTC) thermistor, decreasing in resistance as the temperature rises. Refer to Electronic Engine Controls article.
ENGINE COOLANT
The long life engine coolant is formulated to last for 5 years or 240,000 km (150,000 miles). The coolant is silicate free and orange in color. The long life engine coolant must not be mixed with conventional engine coolant.
Scheme 63
| Item Number | Description |
|---|---|
| 1 | Dual coolant flow valve |
| 2 | EGR valve |
| 3 | Throttle body |
| 4 | Heater core |
| 5 | Water pump |
| 6 | Engine bank (left-hand) |
| 7 | Thermostat |
| 8 | Engine oil cooler |
| 9 | Lower hose |
| 10 | Coolant expansion tank |
| 11 | Radiator |
| 12 | Auxiliary coolant flow pump |
| 13 | Upper hose |
Scheme 64
| Item Number | Description |
|---|---|
| A | Single engine oil cooler variant |
| B | Twin engine oil cooler variant |
| 1 | Radiator assembly |
| 2 | Cooling fan shroud |
| 3 | Condenser |
| 4 | Right Hand (RH) engine oil cooler |
| 5 | Left Hand (LH) engine oil cooler |
| 6 | Engine oil cooler |
| 7 | Intercooler pump |
| 8 | Intercooler |
| 9 | Power steering oil cooler |