Nissan Frontier. Manual - part 1298

VTL-14

< REMOVAL AND INSTALLATION >

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY

Component

INFOID:0000000009478817

Heater and Cooling Unit Assembly

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

Removal and Installation

INFOID:0000000009478818

REMOVAL

CAUTION:

AWIIA1532GB

1.

High-pressure A/C pipe

2.

Low-pressure A/C pipe

3. Expansion valve

4.

Heater core and evaporator pipes grommet

5.

A/C drain hose grommet

6. A/C drain hose

7.

Heater core pipe mounts

8.

Heater core pipes

9. Heater and cooling unit assembly

Front

HEATER & COOLING UNIT ASSEMBLY

VTL-15

< REMOVAL AND INSTALLATION >

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Before servicing, turn the ignition switch off, disconnect both battery terminals and wait at least 3 min-

utes.
1. Move the two front seats to the rear most position on the seat track.
2. Discharge the refrigerant from the A/C system. Refer to 

HA-14, "HFC-134a (R-134a) Service Procedure"

.

3. Drain the coolant from the engine cooling system. Refer to 

CO-12, "Changing Engine Coolant"

(QR25DE), 

CO-40, "Changing Engine Coolant"

 (VQ40DE).

4. Disconnect the battery negative and positive terminals. Refer to 

PG-84, "Battery"

.

5. For vehicles equipped with the VQ40DE engine, remove the RH

heater core pipes nut.

6. Disconnect the heater core hoses from the heater core.
7. Disconnect the high- and low-pressure A/C pipes from the

expansion valve.

8. Remove the instrument panel and center console. Refer to 

IP-

14, "Exploded View"

.

9. Remove the two front floor ducts.
10. Remove the steering column. Refer to 

ST-12, "Removal and

Installation"

.

11. Disconnect the instrument panel wire harness at the RH and LH

in-line connector brackets, and the fuse block (SMJ) harness connectors. Refer to 

PG-39, "Harness Lay-

out"

.

12. Remove the covers then remove the three steering member bolts from each side to disconnect the steer-

ing member from the vehicle body. Refer to 

IP-14, "Exploded View"

.

13. Remove the heater and cooling unit assembly with it attached to the steering member from the vehicle.

CAUTION:

• Use care not to damage the seats and interior trim panels when removing the heater and cooling

unit assembly with it attached to the steering member.

14. Remove the heater 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 the O-ring of the low-pressure A/C pipe and high-pressure A/C pipe for installation.

• After charging the refrigerant, check for leaks. Refer to 

HA-18, "Checking of Refrigerant Leaks"

.

NOTE:

• Fill the engine cooling system with the specified coolant mixture. Refer to 

CO-12, "Changing Engine Cool-

ant"

 (QR25DE), 

CO-40, "Changing Engine Coolant"

 (VQ40DE).

• Recharge the A/C system. Refer to 

HA-14, "HFC-134a (R-134a) Service Procedure"

.

WJIA1292E

VTL-16

< REMOVAL AND INSTALLATION >

EVAPORATOR

EVAPORATOR

Removal and Installation

INFOID:0000000009478819

Heater and Cooling Unit Assembly

AWIIA1533ZZ

1.

Center ventilator connector duct

2.

Heater core cover

3. Intake air case

4.

Heater core and evaporator pipes 
bracket

5.

Heater core and evaporator pipes grommet 6. Heater core

7.

Upper heater and cooling unit case

8.

Evaporator and expansion valve assembly 9. Lower heater and cooling unit 

case

10. Variable blower control / Blower motor 

resistor

11. Blower motor

EVAPORATOR

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REMOVAL

1. Remove the front heater and cooling unit assembly. Refer to 

VTL-19, "Component"

.

2. Separate the heater and cooling unit case.
3. Remove the evaporator and expansion valve assembly.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Do not reuse O-rings.

• Apply A/C to the O-rings on the A/C low-pressure flexible A/C hose and the high-pressure A/C pipe

for installation.