Nissan Pathfinder (2006 year). Manual - part 59

HEATER & COOLING UNIT ASSEMBLY

ATC-137

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ATC

2006 Pathfinder

Rear Heater and Cooling Unit Assembly

Removal and Installation

EJS004PU

FRONT HEATER AND COOLING UNIT ASSEMBLY
Removal

1.

Discharge the refrigerant from the A/C system. Refer to 

ATC-154, "Discharging Refrigerant"

 .

2.

Drain the coolant from the engine cooling system. Refer to 

MA-13, "DRAINING ENGINE COOLANT"

 .

WJIA1403E

1.

Rear high- and low-pressure A/C pipes

2.

Rear heater core hoses

3.

Rear high- and low-pressure A/C pipes 
cover

4.

Underfloor rear high- and low-pressure A/C 
and heater core pipes

5.

Rear expansion valve

6.

Rear heater and cooling unit assembly

ATC-138

HEATER & COOLING UNIT ASSEMBLY

2006 Pathfinder

3.

Remove the front heater core pipes RH nut.

4.

Disconnect the front heater core hoses from the front heater
core.

5.

Disconnect the high- and low-pressure A/C pipes from the front
expansion valve.

6.

Move the two front seats to the rearmost position on the seat
track.

7.

Remove the instrument panel and console panel. Refer to 

IP-10,

"Removal and Installation"

 .

8.

Remove the two front floor ducts.

9.

Remove the steering column. Refer to 

PS-10, "Removal and

Installation"

 .

10. Disconnect the instrument panel wire harness at the RH and LH in-line connector brackets, and the fuse

block (SMJ) electrical connectors. Refer to 

PG-43, "Harness Layout"

 .

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

ing member from the vehicle body.

12. Remove the front heater and cooling unit assembly with it attached to the steering member, from the vehi-

cle.

CAUTION:

●

Use care not to damage the seats and interior trim panels when removing the front heater and
cooling unit assembly with it attached to the steering member.

●

Use suitable plugs on the heater core pipes to prevent coolant leakage.

13. Remove the front heater and cooling unit assembly from the steering member.

Installation

Installation is in the reverse order of removal.

CAUTION:

●

Replace the O-ring of the low-pressure A/C pipe and high-pressure A/C pipe with a new one, and
apply compressor oil to the O-ring for installation. Refer to 

ATC-156, "Components"

 .

●

After charging the refrigerant, check for leaks. Refer to 

ATC-170, "Checking for Refrigerant Leaks"

.

NOTE:

●

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

MA-14, "REFILLING ENGINE

COOLANT"

 .

●

Recharge the A/C system. Refer to 

ATC-154, "Evacuating System and Charging Refrigerant"

 .

REAR HEATER AND COOLING UNIT ASSEMBLY
Removal

1.

Discharge the refrigerant from the A/C system. Refer to 

ATC-154, "Discharging Refrigerant"

 .

2.

Drain the coolant from the engine cooling system. Refer to 

MA-13, "DRAINING ENGINE COOLANT"

 .

3.

Remove the luggage side lower finisher RH. Refer to 

EI-27, "Components"

 .

4.

Disconnect the rear heater core hoses from the rear heater core.

5.

Disconnect the rear A/C high- and low-pressure A/C pipes from the rear expansion valve.

6.

Disconnect the following electrical connectors:

●

Rear blower motor

●

Rear blower motor resistor

●

Rear air mix door motor

7.

Disconnect the ducts from the rear heater and cooling unit assembly.

8.

Remove the three bolts to remove the rear heater and cooling unit assembly.

Installation

Installation is in the reverse order of removal.

LJIA0165E

HEATER & COOLING UNIT ASSEMBLY

ATC-139

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ATC

2006 Pathfinder

CAUTION:

●

Replace the O-ring of the low-pressure A/C pipe and high-pressure A/C pipe with a new one, and
apply compressor oil to the O-ring for installation. Refer to 

ATC-156, "Components"

 .

●

After charging the refrigerant, check for leaks. Refer to 

ATC-170, "Checking for Refrigerant Leaks"

.

NOTE:

●

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

MA-14, "REFILLING ENGINE

COOLANT"

 .

●

Recharge the A/C system. Refer to 

ATC-154, "Evacuating System and Charging Refrigerant"

 .

ATC-140

HEATER CORE

2006 Pathfinder

HEATER CORE

PFP:27140

Components

EJS004PV

Front Heater and Cooling Unit Assembly

Rear Heater and Cooling Unit Assembly

LJIA0167E

1.

Front heater core and evaporator pipe 
bracket

2.

Front heater core

3.

Front heater and cooling unit assembly

4.

Front heater core cover

LJIA0168E

1.

Rear heater and cooling unit assembly

2.

Rear blower motor

3.

Rear heater core bracket

4.

Rear heater core

HEATER CORE

ATC-141

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ATC

2006 Pathfinder

Removal and Installation

EJS004PW

FRONT HEATER CORE
Removal

1.

Remove the front heater and cooling unit assembly. Refer to 

ATC-137, "FRONT HEATER AND COOLING

UNIT ASSEMBLY"

 .

2.

Remove the three screws and remove the front heater core cover.

3.

Remove the front heater core and evaporator pipe bracket.

4.

Remove the front heater core.

NOTE:
If the in-cabin microfilters are contaminated from coolant leaking
from the front heater core, replace the in-cabin microfilters with
new ones before installing the new front heater core.

Installation

Installation is in the reverse order of removal.

REAR HEATER CORE
Removal

1.

Partially drain the engine cooling system. Refer to 

MA-13, "DRAINING ENGINE COOLANT"

 .

2.

Remove the rear heater and cooling unit assembly. Refer to 

ATC-138, "REAR HEATER AND COOLING

UNIT ASSEMBLY"

 .

3.

Remove the rear heater core bracket.

4.

Remove the heater core.

Installation

Installation is in the reverse order of removal.

LJIA0134E

ATC-142

HEATER PUMP

2006 Pathfinder

HEATER PUMP

PFP:92264

Removal and Installation

EJS004PX

Heater Pump

REMOVAL

1.

Partially drain the engine cooling system. Refer to 

MA-13, "DRAINING ENGINE COOLANT"

 .

2.

Disconnect the heater pump electrical connector.

3.

Disconnect the two heater hoses.

4.

Remove the heater pump from the bracket securing the heater pump to the cowl top.

CAUTION:

Do not disassemble the heater pump, replace the heater pump as an assembly.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

●

The heater pump rubber mount must be fully seated on the bracket.

●

Do not disassemble the heater pump, replace the heater pump as an assembly.

LBIA0414E

1.

Cowl top

2.

Heater pump electrical connector

3.

Heater pump

4.

Heater hose and clamp

5.

Heater hose and clamp

INTAKE DOOR MOTOR

ATC-143

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ATC

2006 Pathfinder

INTAKE DOOR MOTOR

PFP:27730

Removal and Installation

EJS004PY

Intake Door Motor - Front Heater and Cooling Unit Assembly

REMOVAL

1.

Remove the front heater and cooling unit assembly. Refer to 

ATC-137, "FRONT HEATER AND COOLING

UNIT ASSEMBLY"

 .

2.

Remove the steering member from the front heater and cooling unit assembly.

3.

Disconnect the intake door motor electrical connector.

4.

Remove the three screws and remove the intake door motor.

INSTALLATION

Installation is in the reverse order of removal.

LBIA0415E

1.

Front heater and cooling unit assembly

2.

Intake door motor

3.

Air mix door motor (passenger)

4.

Variable blower control

5.

Air mix door motor (driver)

6.

Mode door motor

ATC-144

MODE DOOR MOTOR

2006 Pathfinder

MODE DOOR MOTOR

PFP:27731

Removal and Installation

EJS004PZ

Mode Door Motor - Front Heater and Cooling Unit Assembly

REMOVAL

1.

Remove the instrument panel side finisher. Refer to 

EI-28, "LOWER DASH SIDE FINISHER"

 .

2.

Remove the lower instrument cover. Refer to 

IP-15, "LOWER INSTRUMENT PANEL RH AND LOWER

GLOVE BOX"

 .

3.

Disconnect the mode door motor electrical connector.

4.

Remove the three screws and remove the mode door motor.

INSTALLATION

Installation is in the reverse order of removal.

LBIA0415E

1.

Front heater and cooling unit assembly

2.

Intake door motor

3.

Air mix door motor (passenger)

4.

Variable blower control

5.

Air mix door motor (driver)

6.

Mode door motor