Pathfinder 2WD V6-4.0L (VQ40DE) (2009)
Thermostat: Service and Repair
Removal And Installation
WATER INLET AND THERMOSTAT ASSEMBLY
Removal and Installation
REMOVAL
1. Drain engine coolant from the radiator. Refer to See: Coolant/Service and Repair.
CAUTION:
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Perform this step when engine is cold.
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Do not spill engine coolant on drive belts.
2. Remove air duct and resonator assembly. Refer to See: Engine/Tune-up and Engine Performance Checks/Air Cleaner Housing/Service and
Repair/Removal And Installation.
3. Disconnect radiator hose (lower) and oil cooler hose from water inlet and thermostat assembly.
4. Remove water inlet and thermostat assembly.
CAUTION:
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Do not disassemble water inlet and thermostat assembly.
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Replace water inlet and thermostat assembly as a unit, if necessary.
INSPECTION AFTER REMOVAL
1. Check valve seating condition at ordinary room temperatures. It should seat tightly.
2. Check valve operation.
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Place a thread so that it is caught in the valve of the thermostat. Immerse fully in a container filled with water. Heat while stirring.
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The valve opening temperature is the temperature at which the valve opens and falls from the thread.
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Continue heating. Check the full-open lift amount.
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After checking the full-open lift amount, lower the water temperature and check the valve closing temperature.
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If valve seating at ordinary room temperature, or measured values are out of standard, replace water inlet and thermostat assembly.
INSTALLATION