Nissan Altima HL32 Hybrid. Manual - part 179

WATER PUMP

CO-19

< ON-VEHICLE REPAIR >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

• Visually check that there is no significant dirt or rusting on the

water pump body and vane.

• Check that there is no looseness in the vane shaft, and that it turns

smoothly when rotated by hand.

• If the water pump does not perform properly, replace the water

pump assembly.

INSTALLATION

Installation is in the reverse order of removal.

• When inserting water pipe end to cylinder block, apply a neutral detergent to O-ring. Then insert it immedi-

ately.

INSPECTION AFTER INSTALLATION

• After installing the water pump, check for leaks using the radiator cap tester. Refer to 

CO-10, "System

Inspection"

.

KBIA0155E

CO-20

< ON-VEHICLE REPAIR >

[QR25DE]

THERMOSTAT AND THERMOSTAT HOUSING

THERMOSTAT AND THERMOSTAT HOUSING

Removal and Installation

INFOID:0000000004211295

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

coolant escaping from the radiator. 

REMOVAL

CAUTION:

Perform when the engine is cold.
1. Drain engine coolant from radiator, condenser and liquid tank assembly. Refer to 

CO-11, "Changing

Engine Coolant"

.

2. Remove air cleaner duct (front). Refer to 

EM-24, "Removal and Installation"

.

3. Remove radiator lower hose from the engine coolant inlet side.
4. Remove engine coolant inlet and thermostat.

INSPECTION AFTER REMOVAL

1.

Thermostat 

2.

O-ring

3.

Engine coolant inlet

4.

Water control valve

5.

Gasket

6.

Engine coolant outlet

7.

Copper washer

8.

Engine coolant temperature sensor

9.

Heater pipe

A. To electronic throttle control

B. To oil cooler

C. To heater

D. To heater

E. To electronic throttle control

F.

To oil cooler

⇐ Engine front

AWBIA0005GB

THERMOSTAT AND THERMOSTAT HOUSING

CO-21

< ON-VEHICLE REPAIR >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

• 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. 

• The valve opening temperature is the temperature at which the

valve opens and the falls from the thread.

• Continue heating. Check the full-open lift amount.

NOTE:

The full-open lift amount standard temperature for the thermostat is

the reference value.

•  After checking the full-open lift amount, lower the water tempera-

ture and check the valve closing temperature. 

INSTALLATION

Installation is in the reverse order of removal.

• Install the engine coolant temperature sensor.

Use Genuine RTV Silicone Sealant or equivalent. Refer to 

GI-15, "Recommended Chemical Products

and Sealants"

.

• Install the thermostat with the whole circumference of the flange

part fitting securely inside the rubber ring. 

• Install the thermostat with the jiggle valve facing upwards. The

position deviation may be within the range of 

±10°.

• If necessary, to install the heater pipe, first apply a mild detergent

to the O-ring and then quickly insert the pipe into the housing.

• Use a new gasket and O-ring for installation.

SLC252B

Thermostat Standard 

Values

Valve opening temperature

80.5 – 83.5

°C (177 – 182°F)     

Full-open lift amount

More than 8 mm / 95

°C (0.315 in / 203°F)

Valve closing temperature

77

°C (171°F) or higher

PBIC0157E

CO-22

< ON-VEHICLE REPAIR >

[QR25DE]

WATER CONTROL VALVE

WATER CONTROL VALVE

Removal and Installation

INFOID:0000000004211296

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

coolant escaping from the radiator, condenser and liquid tank assembly. 

REMOVAL

CAUTION:

Perform when the engine cold.
1. Drain the engine coolant from radiator, condenser and liquid tank assembly. Refer to 

CO-11, "Changing

Engine Coolant"

.

2. Remove air cleaner assembly. Refer to 

EM-24, "Removal and Installation"

.

3. Remove engine room cover, using power tools.
4. Disconnect the upper radiator, condenser and liquid tank assembly hose, heater pipe, electric throttle con-

trol actuator inlet hose, oil cooler hose and heater hoses.

5. Remove the engine coolant temperature sensor.
6. Remove the engine coolant outlet.
7. Remove the water control valve.

1.

Thermostat 

2.

O-ring

3.

Engine coolant inlet

4.

Water control valve

5.

Gasket

6.

Engine coolant outlet

7.

Copper washer

8.

Engine coolant temperature sensor

9.

Heater pipe

A. To electronic throttle control

B. To oil cooler

C. To heater

D. To heater

E. To electronic throttle control

F.

To oil cooler

⇐ Engine front

AWBIA0005GB