Engine Cooling System: Removal & Installation Infiniti Q45 III

Installation

1. Install in the reverse order of removal.
2. Align ID marks to install clips of both right/left end of radiator core. Refer to radiator component illustration on top page.

Scheme 2

Scheme 3

1. Pull the negative pressure valve to open it, and check that it close completely when released. Check that there is no dirt or damage on the valve seat of the radiator cap negative-pressure valve. Check that there are no abnormalities in the opening and closing conditions of the negative-pressure valve.
2. Check radiator cap relief pressure. Standard : 78 - 98 kPa (0.8-1.0 kg/cm 2 , 11-14 psi) Limit : 59 kPa (0.6 kg/cm 2 , 9 psi) When connecting the radiator cap to the radiator cap tester adapter (SST) and radiator cap tester (Commercial service tool). Replace the radiator cap if there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard values.

Removal

1. Remove air duct and air cleaner case. Refer to "AIR DUCT AND AIR CLEANER CASE ".
2. Remove engine undercover with power tool.
3. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-183866-S19457821222005081700000) ". CAUTION: Perform when the engine is cold. Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure fluid escaping from the radiator.
4. Remove battery.
5. Remove the vacuum tank from the front of the engine.
6. Disconnect the radiator hoses (upper/lower).
7. Remove the following parts from the fan shroud: coolant temperature sensor harness, coolant reservoir tank hose, A/T oil cooler hose, mounting bolts for the cooling fan fluid hose bracket.
8. Drain the cooling fan fluid. Because there is no drain plug on the reservoir tank or piping, drain the fluid from the reservoir tank oil inlet and pipe division points. Prepare a container with a volume of approximately 1 l (2-1/8 US pt, 1-3/4 Imp pt) to drain the fluid into.
9. Remove the cooling fan fluid reservoir tank.
10. Disconnect the hoses between the cooling fan motor and cooling fan pump (joined with the water pump), and the hose between the cooling fan motor and the oil cooler. Fluid will leak, so have shop cloths ready.
11. Remove the cooling fan shroud mounting bolts.
12. Remove the radiator mounting bracket. With the radiator moved toward the vehicle front, lift up and remove the cooling fan. CAUTION: Be careful not to scratch or damage the radiator core. When removing the cooling fan pump, remove it together with the water pump. (They can not be separated.) Refer to " «WATER PUMP»(ref-183866-S33445424262005081700000) ". When removing the cooling fan fluid cooler, be careful not to scratch or damage the air conditioner condenser core.

Install in the reverse order of removal referring the following.

1. For bleeding the air from the cooling system, refer to " «REFILLING ENGINE COOLANT»(ref-183866-S05858113842005081700000) ".

1. Drain engine coolant so that no engine coolant comes out from water pump fitting hole. CAUTION: Perform when the engine is cold.
2. Remove below the parts. Engine undercover Air duct and engine room cover For removing engine room cover, refer to "ENGINE ROOM COVER ". Alternator, water pump and A/C compressor belt For removing drive belt, refer to " «SPECIFICATIONS & DRIVE BELT ROUTING»(ref-166353) ". CAUTION: Leave the fixed auto tensioner pulley in its fixed position when removing the drive belt.
3. Disconnect the harness connector for the cooling fan speed control solenoid valve (joined with the water pump).
4. Remove the water pump pulley.
5. Disconnect the cooling fan fluid hose. Because there is no drain plug, drain the fluid from the hose separation point. Prepare a receptacle with a volume of approximately 1 Lt. (2-1 /8 US pt, 1-3/4 Imp pt).
6. Remove the water pump. Engine coolant will leak from the cylinder block, so have a receptacle ready below. CAUTION: Handle the water pump vane so that it does not contact any other parts. Do not disassemble the water pump (including the cooling fan pump and cooling fan speed control solenoid valve).

Scheme 4

1. Visually check that there is no significant dirt or rusting on the water pump body and vane.
2. Check that there is no looseness in the vane shaft, and that it turns smoothly when rotated by hand.
3. Visually check that there is no fluid leakage from the cooling fan pump part and the cooling fan speed control solenoid valve part.
4. If there are any unusualness, replace the water pump assembly.

1. Install in the reverse order of removal.
2. Apply Genuine Nissan Power Steering Fluid II (the cooling fan fluid) or equivalent to the O-ring of the cooling fan fluid hose (on the feed side). Then insert the O-ring to the water pump so that it does not come out of the attachment groove.
3. For bleeding the air from the cooling system, refer to " «REFILLING ENGINE COOLANT»(ref-183866-S05858113842005081700000) ".
4. For bleeding the air from the cooling fan fluid, refer to "INSTALLATION under «COOLING FAN»(ref-183866-S08949419212005081700000) ".

1. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-183866-S19457821222005081700000) ". CAUTION: Perform when the engine is cold.
2. Remove air duct and engine room cover. For removing engine room cover, refer to "AIR DUCT AND ENGINE ROOM COVER ".
3. Remove water suction hose from water inlet side.
4. Remove water inlet and thermostat.
5. Remove intake manifold upper and intake manifold lower.
6. Remove water connector and water control valve.
7. Disconnect fuel injector harness, and remove thermostat housing, water outlet pipe, rear water outlet and heater pipe (between left and right banks).

Scheme 5

Scheme 6

1. Place a thread so that it is caught in the valves of the thermostat and water control valve. Immerse fully in a container filled with water. Heat while stirring. (The example in the figure shows the thermostat.)
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. NOTE: The full-open lift amount standard temperature for the water control valve is the reference value.
4. After checking the full-open lift amount, lower the water temperature and check the valve closing temperature. Standard values

Install in the reverse order of removal.

Scheme 7

Scheme 8

1. Install the thermostat and water control valve with the whole circumference of each flange part fit securely inside the rubber ring. (The example in the figure shows the thermostat.)
2. Install the thermostat with the jiggle-valve facing upwards. (The position deviation may be within the range of +/- 10 °)
3. Install the water control valve with the up-mark facing up and the frame center part facing upwards. (The position deviation may be within the range of +/- 10 °)

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.

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13