Nissan Titan. Manual - part 655

HEATER & COOLING UNIT ASSEMBLY

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HEATER & COOLING UNIT ASSEMBLY

Removal and Installation

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REMOVAL

NOTE:

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

ing.
1. Move the two front seats to the full rearward position on the seat track.
2. Disconnect the battery negative terminal and battery positive terminal.
3. Discharge the refrigerant from the A/C system. Refer to 

HA-20, "HFC-134a (R-134a) Service Procedure"

.

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

CO-11, "Changing Engine Coolant"

.

5. Disconnect the heater hoses from the heater core.

1.

High-pressure A/C pipe

2.

Expansion valve

3.

Low-pressure A/C pipe

4.

A/C drain hose

5.

Heater and cooling unit assembly

Front

AWIIA1605ZZ

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< REMOVAL AND INSTALLATION >

HEATER & COOLING UNIT ASSEMBLY

6. Disconnect the high/low pressure pipes from the expansion valve.

CAUTION:

Cap or wrap the joint of the pipes with suitable material such as vinly tape to avoid entry of air. 

7. Remove the instrument panel and console panel. Refer to 

IP-11, "Removal and Installation"

.

8. Disconnect the instrument panel wire harness at the RH and LH in-line connector brackets and the har-

ness connectors from fuse block (J/B).

9. Disconnect the steering member from each side of the vehicle body.
10. 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.

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

INSTALLATION

Installation is in the reverse order of removal.

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

CO-11, "Changing Engine Cool-

ant"

.

• Recharge the A/C system. Refer to 

HA-20, "HFC-134a (R-134a) Service Procedure"

.

CAUTION:

• Do not reuse O-rings.

• Apply A/C oil to the O-rings of the low-pressure pipe and high-pressure pipe for installation.

• After charging the refrigerant, check for leaks.

HEATER CORE

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HEATER CORE

Removal and Installation

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Heater and Cooling Unit Assembly

REMOVAL

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1.

Heater core cover

2. Heater core pipe bracket

3. Heater core

4.

Upper bracket

5. Upper heater and cooling unit case 6. Evaporator and expansion valve assembly

7.

Lower heater and cooling unit case 8. Blower motor

9. Variable blower control or front blower mo-

tor resistor

Front

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< REMOVAL AND INSTALLATION >

HEATER CORE

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

VTL-13, "Removal and Installation"

.

2. Remove the four screws and remove the upper bracket.
3. Remove the four screws and remove the heater core cover.
4. Remove the heater core pipe bracket.
5. Remove the heater core.

NOTE:

If the in-cabin microfilters are contaminated from coolant leaking

from the heater core, replace the in-cabin microfilters with new

ones before installing the new heater core.

INSTALLATION

Installation is in the reverse order of removal.

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