Nissan Maxima. Instruction — part 299
CO-8
< SYSTEM DESCRIPTION >
[VQ35DE]
COOLING SYSTEM
COOLING SYSTEM
Cooling Circuit
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1.
Cylinder block (RH)
2.
Oil cooler
3.
Cylinder head (RH)
4.
Water pump
5.
Radiator
6.
Water inlet
7.
Thermostat
8.
Cylinder head (LH)
9.
Cylinder block (LH)
A.
To heater
B.
To electric throttle control actuator
C. From heater
D.
From electric throttle control actuator
AWBIA1460ZZ
COOLING SYSTEM
CO-9
< SYSTEM DESCRIPTION >
[VQ35DE]
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Schematic
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WBIA0562E
CO-10
< PERIODIC MAINTENANCE >
[VQ35DE]
ENGINE COOLANT
PERIODIC MAINTENANCE
ENGINE COOLANT
System Inspection
INFOID:0000000009469264
WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
coolant escaping from the radiator. Wrap a thick cloth around the radiator cap. Slowly turn it a quarter
turn to allow built-up pressure to escape. Carefully remove the radiator cap by turning it all the way.
CHECKING COOLING SYSTEM HOSES
Check hoses for the following:
• Improper attachment
• Leaks
• Cracks
• Damage
• Loose connections
• Chafing
• Deterioration
CHECKING RESERVOIR TANK LEVEL
• Check if the reservoir tank coolant level is within MIN to MAX
range when the engine is cool.
• Adjust coolant level if it is too much or too little.
CHECKING COOLING SYSTEM FOR LEAKS
To check for leaks, apply pressure to the cooling system using suit-
able tool and Tool.
WARNING:
Do not remove the radiator cap when the engine is hot. Serious
burns could occur from high pressure coolant escaping from
the radiator.
CAUTION:
Higher pressure than specified may cause radiator damage.
CHECKING RADIATOR CAP
1. Inspect the radiator cap.
• Replace the radiator cap if the metal plunger cannot be seen around the edge of the black rubber gas-
ket.
• Replace the radiator cap if deposits of waxy residue or other foreign material are on the black rubber
gasket or the metal retainer.
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
SMA412B
Tool number
: EG17650301 (J-33984-A)
Leakage test pressure
: Refer to
WBIA0568E
ENGINE COOLANT
CO-11
< PERIODIC MAINTENANCE >
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2. Pull the negative-pressure valve to open it and check that it
closes 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 clos-
ing conditions of the negative-pressure valve.
3. Check radiator cap relief pressure using suitable tool and Tool.
• When connecting the radiator cap to the tester, apply water or
coolant to the radiator cap seal surface.
• Replace the radiator cap if there is an abnormality in the nega-
tive-pressure valve, or if the open-valve pressure is outside of
the standard values.
CHECKING RADIATOR
Check radiator for mud or clogging. If necessary, clean radiator as follows.
CAUTION:
• Be careful not to bend or damage the radiator fins.
• When radiator is cleaned on-vehicle, remove surrounding parts in order to access the radiator core.
Tape the harness and electrical connectors to prevent water from entering.
1. Spray water to the back side of the radiator core using a side to side motion from the top down.
2. Stop spraying when debris no longer flows from radiator core.
3. Blow air into the back side of radiator core using a side to side motion from the top down.
• Use compressed air lower than 490 kPa (5 kg/cm
2
, 71 psi) and keep distance more than 30 cm (11.8 in).
4. Continue to blow air until no water sprays out.
5. Check for coolant leaks. Repair as necessary.
Changing Engine Coolant
INFOID:0000000009469265
WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
coolant escaping from the radiator. Wrap a thick cloth around the radiator cap. Slowly turn it a quarter
turn to allow built-up pressure to escape. Carefully remove the radiator cap by turning it all the way.
DRAINING ENGINE COOLANT
1. Remove the engine under cover. Refer to
EM-23, "Removal and Installation"
.
2. Open radiator drain plug at the bottom of radiator and remove the radiator cap. This is the only step
required for a partial cooling system drain.
CAUTION:
Do not allow the coolant to contact drive belt.
3. If removing the heater core, remove the upper heater hose from the engine coolant outlet and apply mod-
erate air pressure of 103.46 kPa (1.055 kg-cm
2
, 15 psi) maximum for 30 seconds into the hose to blow out
excess coolant from the core.
4. For a complete cooling system drain, remove the reservoir tank and drain the coolant, and then clean the
reservoir tank before installation.
CAUTION:
Do not allow the coolant to contact drive belt.
Standard stroke: 0.7 mm – 1.7 mm (0.03 – 0.07 in)
SMA967B
Tool number
: EG17650301 (J-33984-A)
Standard
WBIA0570E
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