Page 2737 of 3051
SLC556AB
6. Remove water pump.
CAUTION:
+When removing water pump assembly, be careful not to
get coolant on drive belt.
+Water pump cannot be disassembled and should be
replaced as a unit.
+After installing water pump, connect hose and clamp
securely, then check for leaks using radiator cap tester.
SLC433A
7. Use a scraper to remove liquid gasket from water pump.
+Also remove traces of liquid gasket from mating surface
of cylinder block.
SLC434AA
8. Apply a continuous bead of liquid gasket to mating surface of
water pump.
+Use Genuine Liquid Gasket or equivalent.
When filling radiator with coolant, refer to LC-38, ªChanging
Engine Coolantº.
When installing drive belts, refer to EM-86, ªChecking Drive
Beltsº.
9. Install any parts removed in reverse order of removal.
SLC408C
INSPECTIONNLLC0128+Check body assembly for rust or corrosion.
+Check for rough operation due to excessive end play.
ENGINE COOLING SYSTEMSR
Water Pump (Cont'd)
LC-34
Page 2738 of 3051
Thermostat
REMOVAL AND INSTALLATIONNLLC0134
SLC267B
Be careful not to spill coolant over engine compartment. Use
a rag to absorb coolant.
1. Drain engine coolant.
2. Remove lower radiator hose.
3. Remove water inlet, then take out thermostat.
SLC767
4. Install thermostat with jiggle valve or air bleeder at upper side.
+Apply a continuous bead of liquid gasket to mating sur-
face of water inlet.
+After installation, run engine for a few minutes, and check
for leaks.
ENGINE COOLING SYSTEMSR
Thermostat
LC-35
Page 2739 of 3051
SLC343
INSPECTIONNLLC01351. Check for valve seating condition at normal room temperature.
It should seat tightly.
2. Check valve opening temperature and valve lift.
Valve opening temperature ÉC (ÉF) 82 (180)
Valve lift mm/ÉC (in/ÉF) More than 8/95 (0.31/203)
3. Then check if valve closes at 5ÉC (9ÉF) below valve opening
temperature.
SLC268B
Water Outlet
INSPECTIONNLLC0136Visually inspect for water leaks. If there is leakage, apply liquid
gasket.
BLC004
INSTALLATIONNLLC01371. Use a scraper to remove old liquid gasket from water outlet.
+Also remove traces of liquid gasket from mating surface
of cylinder head.
2. Apply a continuous bead of liquid gasket to mating surface of
water outlet.
+Use Genuine Liquid Gasket or equivalent.
+When installing, tighten water outlet bolts to the specified
torque.
: 6.3 - 8.3 N´m (0.64 - 0.85 kg-m, 55.6 - 73.8 in-lb)
ENGINE COOLING SYSTEMSR
Thermostat (Cont'd)
LC-36
Page 2740 of 3051
Radiator
COMPONENTSNLLC0138
NLC093
Cooling Fan Control SystemNLLC0139Cooling fans are controlled by the ECM. For details, refer to
EC-887, ªCooling Fanº.
ENGINE COOLING SYSTEMSR
Radiator
LC-37
Page 2741 of 3051

Changing Engine Coolant=NLLC0108WARNING:
To avoid the danger of being scalded, never change the cool-
ant when the engine is hot.
Ð DRAINING ENGINE COOLANT ÐNLLC0108S011. Set air conditioning system as follows to prevent coolant from
remaining in the system.
a. Turn ignition switch ªONº and set temperature controller to
maximum hot position.
b. Wait 10 seconds before turning ignition switch OFF.
SMA033D
2. Remove lower radiator hose and remove radiator cap to drain
coolant.
3. Remove reservoir tank, drain coolant, then clean reservoir
tank.
Install it temporarily.
+Be careful not to allow coolant to contact drive belts.
SMA379C
SMA073D
4. Remove cylinder block drain plug and air relief plug.
5. Check drained coolant for contaminants such as rust, corro-
sion or discoloration.
If contaminated, flush engine cooling system.
Refer to ªÐFLUSHING COOLING SYSTEMк, LC-39.
Ð REFILLING ENGINE COOLANT ÐNLLC0108S021. Install reservoir tank, radiator drain plug, and cylinder block
drain plug.
+Apply sealant to the thread of cylinder block drain plug.
: 34.3 - 44.1 N´m (3.5 - 4.5 kg-m, 25 - 33 ft-lb)
ENGINE COOLING SYSTEMSR
Changing Engine Coolant
LC-38
Page 2742 of 3051

SMA182B
2. Fill radiator slowly with coolant until coolant spills from the air
relief plug, then install air relief plug.
3. Fill radiator and reservoir tank to specified level.
Air relief plug:
: 7.2 - 9.8 N´m (0.73 - 1.0 kg-m, 63.4 - 86.8 in-lb)
+Use genuine Nissan anti-freeze coolant or equivalent.
+Pour coolant through coolant filler neck slowly to allow air
in system to escape.
Refer to ªRECOMMENDED FLUIDS AND LUBRICANTSº,
MA-20.
Coolant capacity (With reservoir tank):
6.75!(6 Imp qt)
Reservoir tank capacity (for MAX level):
0.7!(5/8 Imp qt)
4. Warm up engine to normal operating temperature without
radiator cap installed.
+If coolant overflows radiator filler hole, install filler cap.
5. Run engine at 2,500 rpm for 10 seconds and return to idle
speed with radiator cap installed.
+Repeat two or three times.
Watch coolant temperature gauge so as not to overheat the
engine.
6. Stop engine and cool it down.
+Cool down using a fan to reduce the time.
+If necessary, refill radiator up to filler neck with coolant.
7. Refill reservoir tank to Max line with coolant.
8. Repeat step 5 through step 7 two or more times with radiator
cap installed until coolant level no longer drops.
9. Check cooling system for leaks with engine running.
10. Warm up engine, and check for sound of coolant flow while
running engine from idle up to 3,000 rpm with heater tempera-
ture controller set at several positions between COOL and
HOT.
+Sound may be noticeable at heater water cock.
11. If sound is heard, bleed air from cooling system by repeating
steps 5 through 7 until coolant level no longer drops
+Clean excess coolant from engine.
Ð FLUSHING COOLING SYSTEM ÐNLLC0108S031. Open air relief plug.
2. Fill radiator with water until water spills from the air relief hole,
then close air relief plug. Fill radiator and reservoir tank with
water and reinstall radiator cap.
3. Run engine and warm it up to normal operating temperature.
4. Rev engine two or three times under no-load.
5. Stop engine and wait until it cools down.
6. Drain water.
7. Repeat steps 1 through 6 until clear water begins to drain from
radiator.
ENGINE COOLING SYSTEMSR
Changing Engine Coolant (Cont'd)
LC-39
Page 2743 of 3051
Overheating Cause AnalysisNLLC0109
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
Ð Thermostat stuck closed Ð
Damaged finsDust contamination or
paper clogging
Mechanical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling fan does not oper-
ate
ÐÐ High resistance to fan
rotation
Damaged fan blades
Damaged radiator shroud Ð Ð Ð
Improper coolant mixture
ratioÐÐ Ð
Poor coolant quality Ð Ð Ð
Insufficient coolantCoolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deterioration
Cylinder head gasket dete-
rioration
ENGINE COOLING SYSTEMSR
Overheating Cause Analysis
LC-40
Page 2744 of 3051

Symptom Check items
Except cool-
ing system
parts mal-
functionÐ Overload on engineAbusive drivingHigh engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system mal-
function
Ð Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper Ð
Ð Blocked radiator grilleInstalled car brassiere
Mud contamination or
paper clogging
Blocked radiator Ð
Blocked condenser
Ð
Installed large fog lamp
Service Data and Specifications (SDS)
THERMOSTATNLLC0110
Valve opening temperature ÉC (ÉF) 82 (180)
Valve lift mm/ÉC (in/ÉF)More than 8/95 (0.31/203)
RADIATORNLLC0111Unit: kPa (bar, kg/cm2, psi)
Cap reliefpressureStandard 78 - 98 (0.78 - 0.98, 0.8 - 1.0, 11 - 14)
Limit 59 - 98 (0.59 - 0.98, 0.6 - 1.0,9-14)
Leakage test pressure157 (1.57, 1.6, 23)
COOLANT CAPACITYNLLC0112Unit:!(Imp qt)
With reservoir tank6.75 (6)
Reservoir tank0.7 (5/8)
ENGINE COOLING SYSTEMSR
Overheating Cause Analysis (Cont'd)
LC-41