Qashqai J11. Engine cooling system — part 3
DESCRIPTION
CO-33
< SYSTEM DESCRIPTION >
[MR20DD]
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M/T models
JPBIA6909ZZ
Water pump
Thermostat
Water inlet
Water inlet
Oil cooler
Water control valve
Water outlet
From radiator
To radiator
From heater
To heater
CO-34
< SYSTEM DESCRIPTION >
[MR20DD]
DESCRIPTION
Engine Cooling System Schematic
INFOID:0000000010665070
CVT models
JPBIA6910GB
DESCRIPTION
CO-35
< SYSTEM DESCRIPTION >
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M/T models
JPBIA6911GB
CO-36
< SYMPTOM DIAGNOSIS >
[MR20DD]
OVERHEATING CAUSE ANALYSIS
SYMPTOM DIAGNOSIS
OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
INFOID:0000000010665071
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Thermostat and water con-
trol valve stuck closed
—
Damaged fins
Dust contamination or pa-
per clogging
Physical damage
Clogged radiator cooling
tube
Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow
Cooling fan does not oper-
ate
Fan assembly
—
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud
—
—
—
Improper engine coolant
mixture ratio
—
—
—
Poor engine coolant quality
—
Engine coolant viscosity
—
Insufficient engine coolant
Engine coolant leakage
Cooling hose
Loose clamp
Cracked hose
Water pump
Poor sealing
Reservoir tank cap
Loose
Poor sealing
Radiator
O-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank
Cracked reservoir tank
Overflowing reservoir tank
Exhaust gas leakage into
cooling system
Cylinder head deterioration
Cylinder head gasket deteri-
oration
OVERHEATING CAUSE ANALYSIS
CO-37
< SYMPTOM DIAGNOSIS >
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Except cool-
ing system
parts mal-
function
—
Overload on engine
Abusive driving
High engine rpm under no
load
Driving in low gear for ex-
tended time
Driving at extremely high
speed
Power train system mal-
function
—
Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flow
Blocked bumper
—
—
Blocked radiator grille
Installed car brassiere
Mud contamination or paper
clogging
Blocked radiator
—
Blocked condenser
Blocked air flow
Installed large fog lamp
Symptom
Check items
CO-38
< PERIODIC MAINTENANCE >
[MR20DD]
ENGINE COOLANT
PERIODIC MAINTENANCE
ENGINE COOLANT
Inspection
INFOID:0000000010675878
LEVEL
• Check if the reservoir tank engine coolant level is within the “MIN”
to “MAX” when the engine is cool.
• Adjust the engine coolant level as necessary.
• Check that the reservoir tank cap is tightened.
WARNING:
Never remove reservoir tank cap when engine is hot. Serious
burns could occur from high-pressure engine coolant escaping
from reservoir tank.
LEAKAGE
• To check for leakage, fit the adapter (B) to the reservoir tank, and
then connect it to the reservoir tank cap tester [SST: — (M.S.554-
07)] (A) as shown.
WARNING:
Never remove reservoir tank cap when engine is hot. Serious
burns could occur from high-pressure engine coolant escap-
ing from reservoir tank.
CAUTION:
Higher test pressure than specified may cause radiator dam-
age.
• If anything is found, repair or replace damaged parts.
Draining
INFOID:0000000010675879
WARNING:
• Never remove radiator cap when engine is hot. Serious burns may occur from high-pressure engine
coolant escaping from radiator.
• Wrap a thick cloth around the radiator cap. Slowly turn it a quarter of a turn to release built-up pres-
sure. Then turn it all the way.
1.
Remove engine under cover.
2.
Remove reservoir tank cap.
3.
Open radiator drain plug (1) of radiator.
CAUTION:
Perform this step when engine is cold.
4.
Remove reservoir tank if necessary, and drain engine coolant
and clean reservoir tank before installing. Refer to
5.
Check drained engine coolant for contaminants such as rust,
corrosion or discoloration. If contaminated, flush the engine
cooling system. Refer to
.
Refilling
INFOID:0000000010675880
CAUTION:
E1BIA1145ZZ
Testing pressure: Refer to
E1BIA1147ZZ
: Vehicle front
E1BIA1139ZZ
ENGINE COOLANT
CO-39
< PERIODIC MAINTENANCE >
[MR20DD]
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• Never put additive such as waterleak preventive, since it may cause cooling waterway clogging.
• When refilling use Genuine NISSAN Long Life Antifreeze/Coolant (blue) or equivalent in its quality
mixed with water (distilled or demineralized). Refer to
MA-59, "Fluids and Lubricants"
1.
Install reservoir tank if removed and radiator drain plug (1).
CAUTION:
Be sure to clean drain plug and install with new O-ring.
2.
Check that each hose clamp has been firmly tightened.
3.
Disconnect heater hose (1) at position (
) in the figure.
• Enhance heater hose as high as possible.
4.
Fill reservoir tank with engine coolant.
CAUTION:
Never adhere the engine coolant to electronic equipments (alternator etc.).
• Pour coolant slowly of less than 3 (2-5/8 Imp qt) per minute to allow air in system to escape.
•
5.
When engine coolant spill from heater hose with continuous
flow, connect heater hose and continue filling reservoir tank until
reach “MAX” level
6.
7.
Install radiator cap.
8.
Warm up engine at 3000 rpm until thermostat is opened.
• Check thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
E1BIA1139ZZ
: Vehicle front
JPBIA4208ZZ
Engine coolant capacity
(With reservoir tank at “MAX” level)
Refer to
CO-81, "Periodical Maintenance Specifica-
.
A
: MAX
B
: MIN
Reservoir tank engine coolant capacity
(At “MAX” level)
Refer to
CO-81, "Periodical Maintenance Specification"
JPBIA0102ZZ
RESERVOIR TANK CAP
CO-41
< PERIODIC MAINTENANCE >
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RESERVOIR TANK CAP
Inspection
INFOID:0000000010675882
• Fit the adapter to the reservoir tank cap tester [SST: — (M.S. 554-
07)] (A) as shown.
• When connecting the reservoir tank cap to the reservoir tank cap
tester, apply water or LLC to the reservoir tank cap seal part.
• Check reservoir tank cap relief pressure.
• Replace the reservoir tank cap if the engine coolant passes
through it, or if any fur signs is detected.
CAUTION:
When installing reservoir tank cap, thoroughly wipe out the res-
ervoir tank filler neck to remove any waxy residue or foreign
material.
Standard: Refer to
E1BIA0057ZZ
CO-42
< PERIODIC MAINTENANCE >
[MR20DD]
RADIATOR
RADIATOR
Inspection
INFOID:0000000010675883
Check radiator for mud or clogging. If necessary, clean radiator as follows.
CAUTION:
• Never bend or damage the radiator fins.
• When radiator is cleaned without removal, remove all surrounding parts such as radiator fan, radia-
tor shroud and horns. Then tape the harness and connectors to prevent water from entering.
1.
Apply water by hose to the back side of the radiator core vertically downwards.
2.
Apply water again to all radiator core surface once per minute.
3.
Stop washing if any stains no longer flow out from the radiator.
4.
Blow air into the back side of radiator core vertically downwards.
• Use compressed air lower than 490 kPa (4.9 bar 5 kg/cm
2
, 71psi) and keep distance more than 30 cm (11.8
in).
5.
Blow air again into all the radiator core surface once per minute until no water sprays out.
RADIATOR
CO-43
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
RADIATOR
Exploded View
INFOID:0000000010665098
Removal and Installation
INFOID:0000000010665099
REMOVAL
WARNING:
• Never remove reservoir tank cap when engine is hot. Serious burns may occur from high-pressure
engine coolant escaping from radiator.
Radiator core support
Radiator hose (upper)
Radiator hose (lower)
Cooling fan assembly
Clip
Air guide (LH)
Mounting rubber
Radiator
Air guide (Lower)
Air guide (RH)
Plate-air guide
Radiator mounting bracket
Bolt
E1BIA1180GB
CO-44
< REMOVAL AND INSTALLATION >
[MR20DD]
RADIATOR
• Wrap a thick cloth around the reservoir tank cap. Slowly turn it a quarter of a turn to release built-up
pressure. Then turn it all the way.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
1.
Drain engine coolant from radiator. Refer to
CAUTION:
• Perform this step when the engine is cold.
• Never spill engine coolant on drive belt.
2.
Remove front bumper. Refer to
EXT-19, "Removal and Installation"
3.
Put aside bumper reinforcement with harness assembly.
4.
Remove:
• Radiator air guide RH
.
• Radiator air guide LH
.
• Radiator air guide lower
.
• Radiator bracket mounting upper
.
5.
Put aside radiator core support upper. Refer to
DLK-335, "MR20DD : Removal and Installation"
(Type 2),
DLK-604, "MR20DD : Removal and Installation"
(Type 4),
DLK-785, "MR20DD : Removal and Installation"
(Type 5),
DLK-926, "MR20DD : Removal and Installation"
(Type 6).
6.
Remove plate-air guide.
7.
Separate condenser from radiator.
8.
Remove radiator hose (upper and lower).
9.
Disconnect harness connectors from cooling fan, and move harness aside.
10. Remove radiator and cooling fan assembly.
CAUTION:
Be careful not to damage radiator core and condenser core.
NOTE:
In case of lower pin radiator is damaged, it can be repaired instead of replacing the radiator.
11. Separate radiator from condenser.
INSTALLATION
Install in the reverse order of removal.
CAUTION:
Do not reuse O-rings.
Radiator
NOTE:
E1BIA1181ZZ
RADIATOR
CO-45
< REMOVAL AND INSTALLATION >
[MR20DD]
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When installing radiator core support (upper), check that both upper and lower mounts of radiator are inserted
in the mounting holes of radiator core support (upper, lower).
CAUTION:
Use genuine mounting bolts for the cooling fan assembly and strictly observe the tightening torque.
(Breakage prevention for radiator)
Radiator hose
NOTE:
Insert the radiator hose
all the way to the stopper
or by 33 mm (1.30 in) (hose without a stopper).
• For the orientation of the hose clamp pawl, refer to the figure.
*: Refer to the illustrations for the specific position each hose clamp tab.
• The angle (b) created by the hose clamp pawl and the specified
line (A) must be within
±
30 as shown in the figure.
Unit: mm (in)
A.
Radiator side
B.
Engine side
Radiator hose
Hose end
Paint mark
Position of hose clamp*
Radiator hose (upper)
Radiator side
Upper
A
Engine side
Upper
B
Radiator hose (lower)
Radiator side
Lower
C
Engine side
Upper
D
E.
View E
f.
45
°
g.
45
°
: Vehicle upper
JPBIA4294GB
JPBIA3911ZZ
JPBIA4295ZZ
CO-46
< REMOVAL AND INSTALLATION >
[MR20DD]
RADIATOR
• To install hose clamps
, check that the dimension (A) from the
end of the hose clamp on the radiator hose to the hose clamp is
within the reference value.
Inspection
INFOID:0000000010665080
INSPECTION AFTER INSTALLATION
• Check for leakage of engine coolant using the radiator cap tester adapter (commercial service tool) and the
radiator cap tester (commercial service tool). Refer to
.
• Start and warm up the engine. Visually check that there is no leakage of engine coolant.
Dimension “A”
: 3 mm (0.12 in)
JSBIA0241ZZ
COOLING FAN
CO-47
< REMOVAL AND INSTALLATION >
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COOLING FAN
Exploded View
INFOID:0000000010675844
for symbol marks in the figure.
Removal and Installation
INFOID:0000000010675845
REMOVAL
1.
Drain engine coolant from radiator. Refer to
CAUTION:
• Perform this step engine is cold.
• Never spill engine coolant on drive belt.
2.
Remove front bumper. Refer to
EXT-19, "Removal and Installation"
3.
Remove radiator hose (upper) from radiator.
4.
Remove radiator core support upper. Refer to
DLK-335, "MR20DD : Removal and Installation"
(Type 2),
DLK-604, "MR20DD : Removal and Installation"
(Type 4),
DLK-785, "MR20DD : Removal and Installation"
(Type 5),
DLK-926, "MR20DD : Removal and Installation"
(Type 6).
5.
Disconnect harness connectors from cooling fan, and move harness to aside.
6.
Remove cooling fan assembly.
CAUTION:
Be careful not to damage or scratch on radiator core when removing.
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
Only use genuine parts for fan shroud mounting bolt and observe the specified torque (to prevent
radiator from being damaged).
NOTE:
Fan shroud
Fan motor
Resistor
Radiator
E1BIA1117GB
CO-48
< REMOVAL AND INSTALLATION >
[MR20DD]
COOLING FAN
Cooling fan is controlled by ECM. For details, Refer to
ECH-31, "COOLING FAN CONTROL : System Descrip-
.
Disassembly and Assembly
INFOID:0000000010675859
DISASSEMBLY
1.
Remove cooling fan mounting nut, and then remove the cooling fan.
2.
Remove fan motor.
ASSEMBLY
Note the following, and assemble in the reverse order of disassembly.
• Apply genuine high strength thread locking sealant on fan motor shaft.
Inspection
INFOID:0000000010665084
INSPECTION AFTER DISASSEMBLY
Cooling Fan
Inspect cooling fan for crack or unusual bend.
• If anything is found, replace cooling fan.
WATER PUMP
CO-49
< REMOVAL AND INSTALLATION >
[MR20DD]
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WATER PUMP
Exploded View
INFOID:0000000010665085
Removal and Installation
INFOID:0000000010665086
REMOVAL
1.
Drain engine coolant from radiator. Refer to
CAUTION:
Perform this step when the engine is cold.
2.
Remove front wheel (RH). Refer to
WT-60, "Removal and Installation"
(with TPMS) or
(without TPMS).
3.
Remove front fillet molding (RH). Refer to
EXT-37, "Removal and Installation"
.
4.
Remove front fender protector. Refer ro
EXT-32, "Removal and Installation"
.
5.
Remove drive belts. Refer to
EM-139, "Removal and Installation"
6.
Remove water pump.
• Engine coolant leakage from cylinder block, so have a receptacle ready below.
CAUTION:
• Handle water pump vane so that it does not contact any other parts.
• Water pump cannot be disassembled and should be replaced as a unit.
INSTALLATION
Install in the reverse order of removal.
Inspection
INFOID:0000000010665087
INSPECTION AFTER REMOVAL
Pulley
Water pump
Gasket
: Always replace after every disassembly.
: N·m (kg-m, ft-lb)
: N·m (kg-m, in-lb)
JSBIA1603GB
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