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Engine Cooling System: Removal & Installation Nissan Armada I facelift

Cooling System (Mechanical) 6 illustrations ~661 words

Removal and Installation

WARNINGNever remove the radiator cap when the engine is hot. Serious burns could occur from high-pressure engine coolant escaping from the radiator.

REMOVAL

CAUTIONPerform when the engine is cold.

Scheme 4

Scheme 4
Scheme 4
  1. Remove engine room cover. Refer to " «REMOVAL AND INSTALLATION»(ref-320185-S33486365092009071300000) ".
  2. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-320186-S08775799312009071300000) ".
  3. Remove air cleaner and air duct assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-320185-S30482178812009071300000) ".
  4. Disconnect A/T fluid cooler hoses. Install blind plug to avoid leakage of A/T fluid.
  5. Disconnect radiator upper and lower hoses from radiator. CAUTION: Do not allow coolant to contact drive belts.
  6. Remove the lower radiator shroud. Release the tabs, pull lower radiator shroud rearwards and down to remove.
  7. Remove the radiator shroud upper bolts and remove the radiator shroud upper (A).
  8. Remove the A/C condenser bolts and brackets. NOTE: Lift A/C condenser up and forward to remove from radiator.
  9. Remove A/T oil cooler bolts and oil cooler from radiator and position aside.
  10. Lift up and remove the radiator.
CAUTIONDo not damage or scratch air conditioner condenser and radiator core when removing.

Scheme 5

Scheme 5
Scheme 5

INSTALLATION

Installation is in the reverse order of removal.

Installation is in the reverse order of removal.

  1. Install cooling fan with its front mark "F" facing front of engine. Refer to " «REMOVAL AND INSTALLATION (CRANKSHAFT DRIVEN TYPE)»(ref-320186-S01285834852009071300000) ".
  1. Remove the front bumper. Refer to " «REMOVAL AND INSTALLATION»(ref-320194-S12113945682009071300000) ".
  2. Disconnect harness connector (A) from fan motor.
  3. Remove the bolt and remove the fan grille and motor assembly.

Scheme 6

Scheme 6
Scheme 6

Installation is in the reverse order of removal.

  1. Cooling fan is controlled by ECM. For details, refer to " «DIAGNOSIS PROCEDURE»(ref-320188-S03138264442009071300000) ".

Scheme 7

Scheme 7: Exploded View
Scheme 7: Exploded View
CAUTIONWhen removing water pump, be careful not to get engine coolant on drive belt. Water pump cannot be disassembled and should be replaced as a unit.
  1. Drain engine coolant so that no engine coolant comes out from water pump fitting hole. Refer to " «CHANGING ENGINE COOLANT»(ref-320186-S08775799312009071300000) ". CAUTION: Perform when the engine is cold.
  2. Remove the engine front undercover using power tool.
  3. Remove the air duct and resonator assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-320185-S30482178812009071300000) ".
  4. Remove the drive belt. Refer to " «REMOVAL AND INSTALLATION»(ref-320185-S40419645552009071300000) ".
  5. Remove the water pump pulley.
  6. Remove the water pump.
  1. Engine coolant will leak from the cylinder block, so have a receptacle ready below.
CAUTIONHandle water pump vane so that it does not contact any other parts.

Installation is in the reverse order of removal.

  1. After installation bleed the air from the cooling system. Refer to " «CHANGING ENGINE COOLANT»(ref-320186-S08775799312009071300000) ".

Removal of Thermostat

  1. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-320186-S08775799312009071300000) ". CAUTION: Perform when engine is cold.
  2. Remove the air duct and resonator assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-320185-S30482178812009071300000) ".
  3. Remove the engine room cover using power tools.
  4. Disconnect the water suction hose from the water inlet.
  5. Remove the water inlet and thermostat.

Removal of Thermostat Housing, Water Outlet and Heater Pipe

  1. Remove the intake manifold. Refer to " «REMOVAL AND INSTALLATION»(ref-320185-S36423797132009071300000) ".
  2. Remove the thermostat housing, water outlet and heater pipe.

Removal of Water Cut Valve

  1. Drain the engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-320186-S08775799312009071300000) ". CAUTION: Perform when the engine is cold.
  2. Remove the air duct and resonator assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-320185-S30482178812009071300000) ".
  3. Remove the engine room cover using power tool.
  4. Disconnect the heater hose (heater core side).
  5. Remove the heater hose bracket.
  6. Disconnect the water cut valve connector.
  7. Remove the water cut valve.

Scheme 8

Scheme 8: INSPECTION AFTER REMOVAL
Scheme 8: INSPECTION AFTER REMOVAL
  1. 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.
  2. The valve opening temperature is the temperature at which the valve opens and falls from the thread.
  3. Continue heating. Check the full-open lift amount.
  4. After checking the full-open lift amount, lower the water temperature and check the valve closing temperature.

Standard values

Thermostat
Valve opening temperature80 - 84°C (176 - 183°F)
Full-open lift amountMore than 10 mm/95°C (0.39 in/203°F)
Valve closing temperature77°C (171°F) or higher

THERMOSTAT VALVE OPENING TEMPERATURE SPECIFICATION

Installation is in the reverse order of removal.

Installation of Thermostat

  1. Install the thermostat with the whole circumference of each flange part fit securely inside the rubber ring as shown.
  2. Install the thermostat with the jiggle valve facing upwards.

Scheme 9

Scheme 9
Scheme 9

Installation of Water Outlet Pipe and Heater Pipe

First apply a neutral detergent to the O-rings, then quickly insert the insertion parts of the water outlet pipe and heater pipe into the installation holes.

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