Nissan Altima 2007-2012 Service Manual: Thermostat and thermostat housing

Removal and Installation

1. Thermostat

2. O-ring

3. Engine coolant inlet

4. Water control valve

5. Gasket

6. Engine coolant outlet

7. Copper washer

8. Engine coolant temperature sensor

9. Heater pipe

A. To electric throttle control

B. To oil cooler

C. To heater

D. To heater

E. To electric throttle control

F. To oil cooler

WARNING: Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure coolant escaping from the radiator.

REMOVAL

CAUTION: Perform when the engine is cold.

1. Drain engine coolant from the radiator. Refer to CO-12, "Changing Engine Coolant".

2. Remove the air duct. Refer to EM-25, "Removal and Installation".

3. Remove radiator lower hose from the engine coolant inlet side.

4. Remove engine coolant inlet and thermostat.

INSPECTION AFTER REMOVAL

• Place a thread so that it is caught in the valves of the thermostat.

Immerse fully in a container filled with water. Heat while stirring.

• The valve opening temperature is the temperature at which the valve opens and the falls from the thread.

• Continue heating. Check the full-open lift amount.

NOTE: The full-open lift amount standard temperature for the thermostat is the reference value.

• After checking the full-open lift amount, lower the water temperature and check the valve closing temperature.

INSTALLATION

Installation is in the reverse order of removal.

• Install the engine coolant temperature sensor.

Use Genuine RTV Silicone Sealant or equivalent. Refer to GI-15, "Recommended Chemical Products and Sealants".

• Install the thermostat with the whole circumference of the flange part fitting securely inside the rubber ring.

• Install the thermostat with the jiggle valve facing upwards. The position deviation may be within the range of ±10°.

• If necessary, to install the heater pipe, first apply a mild detergent to the O-ring and then quickly insert the pipe into the housing.

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