Engine Cooling System: Removal & Installation Nissan Maxima A35

REMOVAL

1. Drain coolant from radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) ".
2. Remove hoodledge covers (RH and LH).
3. Remove front bumper fascia. Refer to " «REMOVAL AND INSTALLATION»(ref-388049-S33250933752011022800000) ".
4. Remove engine undercover. Refer to " «REMOVAL AND INSTALLATION»(ref-388049-S33250933752011022800000) ".
5. Remove battery. Refer to " «REMOVAL AND INSTALLATION (BATTERY)»(ref-388040-S08852523192011022800000) ".
6. Disconnect coolant reservoir hose. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
7. Disconnect radiator upper hose and lower hose. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
8. Remove A/C condenser. Refer to " «CONDENSER : REMOVAL AND INSTALLATION FOR CONDENSER»(ref-388042-S37196704882011022800000) ".
9. Disconnect the CVT oil cooler hoses. Plug the hoses to prevent CVT oil loss. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
10. Remove radiator. CAUTION: Do not damage or scratch the radiator core when removing.

INSTALLATION

Installation is in the reverse order of removal.

1. After installation refill engine coolant and check for leaks. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) " and " «SYSTEM INSPECTION»(ref-388046-S42038675292011022800000) ". CAUTION: Do not spill coolant in engine compartment. Use a shop cloth to absorb coolant.

1. Partially drain engine coolant from radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) ". CAUTION: Perform when engine is cold.
2. Remove engine room cover.
3. Remove TCM. Refer to " «REMOVAL AND INSTALLATION»(ref-388054-S20238056362011022800000) ".
4. Remove battery tray. Refer to " «REMOVAL AND INSTALLATION (BATTERY TRAY)»(ref-388040-S08029399692011022800000) ".
5. Disconnect radiator hose (upper).
6. Disconnect fan motor connectors.
7. Remove radiator cooling fan assembly.

Installation is in the reverse order of removal.

1. Cooling fans are controlled by ECM. For details, refer to " «DESCRIPTION»(ref-388048-S37158751352011022800000) ".

Scheme 6

Removal and Installation

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Scheme 11

1. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) ". CAUTION: Perform when the engine is cold.
2. Disconnect coolant reservoir hose and remove coolant reservoir tank. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
3. Remove RH wheel and tire. Refer to " «ADJUSTMENT»(ref-388047-S32116336402011022800000) ".
4. Remove the fender protector side cover (RH). Refer to " «EXPLODED VIEW»(ref-388049-S03328543612011022800000) ".
5. Set No. 1 cylinder at TDC on its compression stroke. Align pointer with TDC mark on crankshaft pulley.
6. Remove drive belt. Refer to " «REMOVAL AND INSTALLATION»(ref-388044-S22307760252011022800000) ".
7. Remove the idler pulley and the A/C idler pulley. Refer to " «REMOVAL AND INSTALLATION OF DRIVE BELT AUTO-TENSIONER»(ref-388044-S37644338502011022800000) ".
8. Remove hoodledge cover (RH).
9. Remove cylinder block front drain plug (1) on water pump side of cylinder block to drain engine coolant from engine.
10. Support engine and remove the front engine insulator and bracket. Refer to " «REMOVAL AND INSTALLATION»(ref-388044-S31213686922011022800000) ".
11. Disconnect RH valve timing control connectors and remove IVT valve and cover RH (bank 1). Refer to " «EXPLODED VIEW»(ref-388044-S00494834172011022800000) ".
12. Remove water pump cover. Refer to " «EXPLODED VIEW»(ref-388044-S00494834172011022800000) ".
13. Remove the timing chain tensioner (primary) as follows: Pull the lever (C) down to release the plunger stopper tab (B). Insert the stopper pin A into the tensioner body hole to hold the lever (C) and keep the plunger stopper tab (B) released. NOTE: An Allen wrench [(1.2 mm (0.047 in)] is used for a stopper pin A as an example. Compress the plunger (D) into the tensioner body (1) by pressing the slack guide (2). Keep the slack guide (2) pressed and lock the plunger (D) in by pushing the stopper pin A through the lever (C) and into the chain tensioner body hole. Remove timing chain tensioner bolts and then remove the timing chain tensioner. CAUTION: Be careful not to drop timing chain tensioner bolts inside timing chain case.
14. Remove the three water pump bolts (A). Make a gap between water pump sprocket (1) and timing chain, by carefully turning crankshaft pulley (2) counterclockwise until timing chain loosens on water pump sprocket (1).
15. Screw M8 bolts [pitch: 1.25 mm (0.49 in) length: approx. 50 mm (1.97 in)] into water pumps upper and lower bolt holes until they reach the timing chain case. Remove water pump. CAUTION: Place a suitable shop cloth below the water pump housing to prevent any engine coolant from dripping into the timing chain case. Pull water pump straight out while preventing vane from contacting socket in installation area. Remove water pump without causing sprocket to contact timing chain.
16. Remove M8 bolts and O-rings from water pump.

Scheme 12

1. Visually check that there is no significant dirt or rusting on the water pump body and vane.
2. Check that the vane shaft is not excessively loose and that it turns smoothly when rotated by hand.
3. If the water pump does not perform properly, replace the water pump assembly.

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1. Install new O-rings to water pump.
2. Apply engine oil and coolant to the O-rings as shown in the figure. Locate the O-ring with white paint mark to engine front side.
3. Hold timing chain to the side (<==) and install the water pump (<==). CAUTION: Do not allow cylinder block to interfere with the O-rings when installing the water pump. Check that timing chain and water pump sprocket are engaged. Tighten water pump bolts alternately and evenly to specification.
4. Remove dust and foreign material completely from installation area of timing chain tensioner and rear timing chain case.
5. Turn the crankshaft pulley approximately 20° clockwise so that the timing chain on the timing chain tensioner side is loose.
6. Apply engine oil to the oil feed hole and timing chain tensioner and install the timing chain tensioner.
7. Remove the stopper pin A.
8. Install IVT valve and cover RH (bank1) and water pump cover. Before installing, remove all traces of liquid gasket from mating surface of water pump cover and IVT cover using a scraper. Also remove traces of liquid gasket from the mating surface of the front cover. Apply a continuous bead of liquid gasket to mating surface of IVT cover and water pump cover. Use Genuine RTV Silicone Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-388039-S31807235822011022800000) ".
9. Install cylinder block front drain plug (1) on water pump side of cylinder block. Apply liquid gasket to the threads of cylinder block front drain plug. Use Genuine RTV Silicone Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-388039-S31807235822011022800000) ". Cylinder block front drain plug : 9.8 N.m (1.0 kg-m, 87 in-lb)
10. Installation of remaining components is in the reverse order of removal. After installation refill engine coolant and check for leaks. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) " and " «SYSTEM INSPECTION»(ref-388046-S42038675292011022800000) ". CAUTION: Do not spill coolant in engine compartment. Use a shop cloth to absorb coolant. After starting engine, let idle for three minutes, then rev engine up to 3,000 RPM under no load to purge air from the high-pressure chamber of the chain tensioner. The engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.

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1. Drain coolant from radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) ".
2. Disconnect coolant reservoir hose and remove coolant reservoir tank. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
3. Disconnect LH VTC solenoid harness connector.
4. Disconnect lower radiator hose from thermostat assembly. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
5. Remove thermostat assembly (water inlet). Do not disassemble thermostat assembly (water inlet). Replace them as a unit, if necessary.

Scheme 19

1. 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.
2. The valve opening temperature is the temperature at which the valve opens and the falls from the thread.
3. Continue heating. Check the full-open lift amount. NOTE: The full-open lift amount standard temperature for the thermostat is the reference value.
4. After checking the full-open lift amount, lower the water temperature and check the valve closing temperature. THERMOSTAT STANDARD VALUES REFERENCE CHART Thermostat Standard Values Valve opening temperature Refer to " «THERMOSTAT»(ref-388046-S35752146242011022800000) " Full-open lift amount Refer to " «THERMOSTAT»(ref-388046-S35752146242011022800000) " Valve closing temperature Refer to " «THERMOSTAT»(ref-388046-S35752146242011022800000) "

Installation is in the reverse order of removal.

Scheme 20

1. Install thermostat with jiggle valve facing upward.
2. After installation refill engine coolant and check for leaks. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) " and " «SYSTEM INSPECTION»(ref-388046-S42038675292011022800000) ". CAUTION: Do not spill coolant in engine compartment. Use a shop cloth to absorb coolant.

Scheme 21

1. Partially drain coolant from radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) ".
2. Remove engine room cover. Refer to " «REMOVAL AND INSTALLATION»(ref-388044-S09328238872011022800000) "
3. Remove front air duct and air cleaner case assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-388044-S37478427172011022800000) ".
4. Disconnect electric throttle control actuator coolant hoses. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
5. Remove radiator hose (upper) and both heater hoses. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
6. Remove connector(s) from heater pipe. NOTE: Cap or plug opening(s) to prevent fluid from spilling.
7. Remove engine coolant temperature sensor on water outlet.
8. Remove water outlet, heater pipe, water connector, and water bypass pipe nuts and bolts.

1. Installation is in the reverse order of removal. Securely insert each hose, and install a clamp at a position where it does not interfere with the pipe bulge. CAUTION: Use new gasket for installation When inserting heater pipe and water bypass pipe into water connector, apply neutral detergent to new O-rings. CAUTION: Use new O-rings for installation After installation refill engine coolant and check for leaks. Refer to " «CHANGING ENGINE COOLANT»(ref-388046-S32332017542011022800000) " and " «SYSTEM INSPECTION»(ref-388046-S42038675292011022800000) ".