2008 ENGINE
Mechanism & Function - Cooling (H4SO)
GENERAL
The engine cooling system consists of a down-flow radiator featuring high heat-dissipation performance,
an electric-motor-driven fan, a water pump, a thermostat, and an engine coolant temperature sensor.
The reservoir tank is made of translucent resin and enables easy confirmation of the coolant level. Also,
coolant should be added to the reservoir tank when replenishment is necessary.
The ECM controls the operation of the radiator main fan and sub fan depending on the signals from the
engine coolant temperature sensor, vehicle speed sensor and A/C switch.
COOLING CIRCUITS
The cooling system operates in three different phases depending on the temperature of the engine coolant.
1st phase (thermostat closed)
When the engine coolant temperature is lower than the preset value, the thermostat remains closed. The
coolant flows through the heater circuit. This permits the engine to warm up quickly.
2nd phase (thermostat open)
When the engine coolant temperature reaches the preset value, the thermostat opens. The coolant flows
through the radiator where it is cooled.
3rd phase (thermostat open and radiator fan operating)
When the engine coolant temperature becomes higher than the preset value, the ECM receives a signal
from the engine coolant temperature sensor and causes the radiator fan(s) to operate.
2008 Subaru Tribeca
2008 ENGINE Mechanism & Function - Cooling (H4SO)
2008 Subaru Tribeca
2008 ENGINE Mechanism & Function - Cooling (H4SO)
Fig. 1: Cooling Circuits Diagram
Courtesy of SUBARU OF AMERICA, INC.
WATER PUMP
2008 Subaru Tribeca
2008 ENGINE Mechanism & Function - Cooling (H4SO)
Fig. 2: Identifying Water Pump And Components
Courtesy of SUBARU OF AMERICA, INC.
MECHANICAL SEAL
The mechanical seal has its seat tightly fitted on the water pump shaft. Since it is a hermetic seal forming an
integral part of the water pump, the water pump cannot be disassembled.
2008 Subaru Tribeca
2008 ENGINE Mechanism & Function - Cooling (H4SO)
Fig. 3: Identifying Mechanical Seal
Courtesy of SUBARU OF AMERICA, INC.
THERMOSTAT
The thermostat has a totally enclosed wax pellet, which expands as the coolant temperature increases. It opens
and closes accurately at the preset temperatures and features high durability.
2008 Subaru Tribeca
2008 ENGINE Mechanism & Function - Cooling (H4SO)
Fig. 4: Identifying Thermostat
Courtesy of SUBARU OF AMERICA, INC.
RADIATOR FAN
DESCRIPTION
Each radiator fan is made of plastic. It is driven by an electric motor, which is retained on a shroud.
2008 Subaru Tribeca
2008 ENGINE Mechanism & Function - Cooling (H4SO)
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2006-2008 Subaru Tribeca Service & Repair Manual
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Description
- The 2006-2008 Subaru Tribeca Service & Repair Manual is a comprehensive resource for fixing vehicle issues, suitable for both professional mechanics and DIY enthusiasts.
- It includes troubleshooting and replacement procedures recommended by the manufacturer, featuring step-by-step instructions, clear images, and exploded-view illustrations.
- Regular maintenance is essential for the durability of your vehicle, and this manual provides the necessary guidance for addressing wear and tear over time.
- With the manufacturer's recommended troubleshooting charts and replacement procedures, this manual enables cost-effective repairs, enhances vehicle reliability, and reduces reliance on repair shops.
- Convenient digital format allows easy access, searchability, and portability on various electronic devices, including PCs, Mac computers, smartphones, and tablets.
- It is also printable for those who prefer physical copies, and requires Adobe Reader for access.
