Nissan Sentra Service Manual: Heating and cooling unit assembly
Exploded view
With air conditioning
- Defroster seal
- Center ventilator seal
- Upper distribution module
- Side ventilator seal (LH)
- Blower motor
- Blower unit
- Intake door motor
- Power transistor
- Power transistor wiring harness
- Front floor duct (lh)
- Vent and defroster linkage
- Mode door motor
- Heater core
- Heater core pipes grommet
- Heating and cooling unit
- In-cabin microfilter
- In-cabin microfilter cover
- Air mix door motor (lh) (automatic a/c only)
- Vent and defroster linkage
- Front floor duct (rh)
- Air mix door motor (RH)
- Expansion valve
- Evaporator
- Aspirator (automatic a/c only)
- Vent and defroster linkage
- Side ventilator seal (rh)
Without air conditioning
- Defroster seal
- Center ventilator seal
- Upper distribution module
- Side ventilator seal (lh)
- Blower motor
- Blower unit
- Intake door motor
- Power transistor
- Power transistor wiring harness
- Front floor duct (LH)
- Vent and defroster linkage
- Mode door motor
- Heater core
- Heater core pipes grommet
- Heating and cooling unit
- In-cabin microfilter
- In-cabin microfilter cover
- Front floor duct (RH)
- Air mix door motor
- Vent and defroster linkage
- Side ventilator seal (RH)
Heating and cooling unit assembly
Heating and cooling unit assembly :
removal and installation
NOTE:
When removing components such as hoses, lines/tubes, etc., cap or plug
openings to prevent fluid from spilling.
REMOVAL
- Discharge the refrigerant. Refer to HA-23, "Recycle Refrigerant".
- Drain the cooling system. Refer to CO-12, "Changing Engine Coolant".
- Remove the instrument panel assembly. Refer to IP-14, "Removal and
Installation".
- Remove the steering column. Refer to ST-12, "Removal and Installation".
- Remove the center console. Refer to IP-17, "Removal and Installation".
- Remove the wiper drive assembly. Refer to WW-62, "Removal and
Installation".
- Remove the steering member bolt (A).
(1): Windshield glass
NOTE:
The steering member bolt (A) can be found near the drivers side
cowl area in the engine compartment.

- Remove the push nut (A) from the expansion valve insulator (1)
and reposition.

- Remove the bolt (A) that retains the low-pressure flexible hose
and high-pressure pipe to the expansion valve.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.

- Disconnect the low-pressure pipe and high-pressure pipe from the
expansion valve.
- Disconnect the heater hoses from the heater core pipes.
- Remove the remaining steering member bolts.
- Disconnect the harness connectors from the heating and cooling unit
assembly and steering member.
- Remove the heating and cooling unit assembly and steering member as an
assembly from the vehicle.
- Separate the heating and cooling unit assembly from the steering member.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
- Do not reuse O-rings.
- Apply A/C oil to new O-rings for installation.
- After charging refrigerant, check for leaks. Refer to HA-21, "Leak
Test".
Heater core
Heater core : removal and installation
REMOVAL
The heater core is not serviced separately and must be replaced with the
heating and cooling unit assembly.
Refer to HA-43, "HEATING AND COOLING UNIT ASSEMBLY : Removal and Installation".
Evaporator
Evaporator : removal and installation
REMOVAL
The evaporator is not serviced separately and must be replaced with the
heating and cooling unit assembly.
Refer to HA-45, "EVAPORATOR : Removal and Installation".
Expansion valve
Expansion valve : removal and installation
REMOVAL
- Discharge the refrigerant. Refer to HA-23, "Recycle Refrigerant".
- Remove the push nut (A) from the expansion valve insulator (1)
and reposition.

- Remove the bolt (A) that retains the low-pressure flexible hose
and high-pressure pipe to the expansion valve.

- Disconnect the low-pressure pipe and high-pressure pipe from the
expansion valve.
- Remove the expansion valve bolts.
- Remove the expansion valve.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
- Do not reuse O-rings.
- Apply A/C oil to the new expansion valve O-rings for installation.
- After charging refrigerant, check for leaks. Refer to HA-21, "Leak
Test".
Exploded view
Core support upper cover
High-pressure pipe
High-pressure flexible hose
Refrigerant pressure sensor
Condenser and liquid tank assembly
Core support upper
Front
Conde ...
Service Data and Specification (SDS)
COMPRESSOR
OIL
REFRIGERANT
...
Other materials:
P0740 Torque converter
DTC Logic
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detection condition
Possible causes
P0740
TORQUE CONVERTER
(Torque Converter Clutch Circuit/
Open)
The TCM torque converter clutch solenoid
valve current monitor readi ...
Waxing
Regular waxing protects the paint surface and
helps retain new vehicle appearance. Polishing is
recommended to remove built-up wax residue
and to avoid a weathered appearance before
re-applying wax.
A NISSAN dealer can assist you in choosing the
proper product.
Wax your vehicle only afte ...
Air fresheners
Most air fresheners use a solvent that could affect
the vehicle interior. If you use an air freshener,
take the following precautions:
Hanging-type air fresheners can cause permanent
discoloration when they contact vehicle
interior surfaces. Place the air freshener
in a location that all ...
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