Nissan Frontier. Manual — part 219
THERMOSTAT AND THERMOSTAT HOUSING
CO-23
< REMOVAL AND INSTALLATION >
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THERMOSTAT AND THERMOSTAT HOUSING
Exploded View
INFOID:0000000009478169
Removal and Installation Thermostat
INFOID:0000000009478170
WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter
of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
1. Drain engine coolant from the radiator. Refer to
CO-12, "Changing Engine Coolant"
CAUTION:
• Perform this step when the engine is cold.
• Do not spill engine coolant on drive belt.
2. Remove the air duct. Refer to
.
3. Disconnect radiator hose (lower) at water inlet side. Refer to
.
4. Remove water inlet, O-ring and thermostat.
CAUTION:
Do not reuse O-rings.
1.
Gasket
2.
Water outlet
3.
Water pump pulley
4.
Water pump
5.
Thermostat
6.
O-ring
7.
Water inlet
8.
Water pump and thermostat housing 9.
Heater pipe
10. Water hose
11. Water hose
12. Heater outlet
13. Engine coolant temperature sensor
14. Water control valve
A.
To heater
B.
To electric throttle control actuator
C.
To oil cooler
Front
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CO-24
< REMOVAL AND INSTALLATION >
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THERMOSTAT AND THERMOSTAT HOUSING
INSPECTION AFTER REMOVAL
• Place a thread so that it is caught in the valve of the thermostat.
Immerse fully in a container filled with water. Heat while stirring.
• The valve opening temperature is the temperature at which the
valve opens and falls from the thread.
• Continue heating. Check the full-open lift amount.
NOTE:
The full-open lift amount standard temperature is the reference
value.
• After checking the full-open lift amount, lower the water tempera-
ture and check the valve closing temperature.
If out of the specification range, replace the thermostat.
INSTALLATION
Installation is in the reverse order of removal.
• Apply a mild soap to a new O-ring before inserting heater pipe end into water pump and thermostat housing.
Then insert it immediately.
Thermostat
• Install thermostat by making O-ring (1) groove fit to thermostat
flange (A) around the whole circumference.
CAUTION:
Do not reuse O-ring.
• Install thermostat with jiggle valve (A) facing upward. The position
may deviate within the range of 20
° (b).
INSPECTION AFTER INSTALLATION
• Check for engine coolant leaks. Refer to
• Start and warm up the engine. Visually check for engine coolant leaks. Repair as necessary.
Removal and Installation Thermostat Housing
INFOID:0000000009478171
WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter
of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.
NOTE:
SLC252B
Thermostat
Standard
Valve opening temperature
Refer to
Full-open lift amount
Valve closing temperature
PBIC3317J
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THERMOSTAT AND THERMOSTAT HOUSING
CO-25
< REMOVAL AND INSTALLATION >
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When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
1. Remove water pump. Refer to
2. Remove thermostat. Refer to
CO-23, "Removal and Installation Thermostat"
.
3. Remove the radiator hose (upper) from the radiator.
4. Remove exhaust manifold cover. Refer to
5. Remove oil level gauge and oil level gauge guide. Refer to
CAUTION:
Plug the oil level gauge guide opening to prevent foreign materials from entering oil pan.
6. Remove A/C compressor without disconnecting the A/C hoses and position aside. Refer to
"Removal and Installation for Compressor"
.
7. Disconnect electric throttle control actuator, oil cooler and heater hose from heater pipe.
8. Remove bolt for heater pipe at water pump and thermostat housing.
9. Disconnect heater pipe from water pump and thermostat housing.
10. Remove water pump and thermostat housing.
CAUTION:
• Do not reuse O-ring.
• Do not reuse gasket.
INSTALLATION
Installation is in the reverse order of removal.
• Apply a mild soap to O-ring before inserting heater pipe end into water pump and thermostat housing. Then
insert it immediately.
CAUTION:
Do not reuse O-ring.
INSPECTION AFTER INSTALLATION
• Check for engine coolant leaks. Refer to
• Start and warm up the engine. Visually check for engine coolant leaks. Repair as necessary.
CO-26
< REMOVAL AND INSTALLATION >
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WATER CONTROL VALVE
WATER CONTROL VALVE
Exploded View
INFOID:0000000009478172
Removal and Installation
INFOID:0000000009478173
WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter
of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
CAUTION:
Perform when the engine is cold.
1. Remove air ducts and resonator assembly.
2. Partially drain the engine coolant from the radiator. Refer to
CO-12, "Changing Engine Coolant"
.
3. Remove radiator hose (upper) from the water outlet.
4. Remove the heater outlet.
5. Remove the water control valve.
INSPECTION AFTER REMOVAL
1.
Gasket
2.
Water outlet
3.
Water pump pulley
4.
Water pump
5.
Thermostat
6.
O-ring
7.
Water inlet
8.
Water pump and thermostat housing 9.
Heater pipe
10. Water hose
11. Water hose
12. Heater outlet
13. Engine coolant temperature sensor
14. Water control valve
A.
To heater
B.
To electric throttle control actuator
C.
To oil cooler
Front
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