Nissan Armada 2025-2026 Service and Repair Manual: Front Heater & Cooling Unit Assembly

Exploded View

REMOVAL

	Front blower unit assembly		Front heater & cooling unit assembly		Steering member
	Drain hose
	: Always replace after every disassembly.
: Indicates that the part is connected at points with same symbol in actual vehicle.

DISASSEMBLY

	Heater pipe support		Front expansion valve		Cooler grommet
	Cooler packing		Front case lower assembly		Sub harness
	J nut		Spring nut		Front heater & cooling unit
	Front heater core		Front case upper		O-ring
	Front evaporator		Intake sensor
	: Clip
	: Pawl
	: Always replace after every disassembly.
	: N·m (kg-m, in-lb)

Front Heater & Cooling Unit Assembly

Removal and Installation

REMOVAL

CAUTION:

• Perform lubricant return operation before each refrigeration system disassembly. However, if a large amount of refrigerant or lubricant leak is detected, never perform lubricant return operation. Refer to Perform Lubricant Return Operation.

• When disconnect the A/C piping related parts, cap or wrap the joint of those parts with suitable material such as vinyl tape to avoid the entry of air.

Use a refrigerant collecting equipment (for HFO-1234yf) to discharge the refrigerant. Refer to Recycle Refrigerant.

Drain engine coolant from cooling system. Refer to ENGINE COOLANT : Draining.

Disconnect front heater pipe assembly from front heater core. Refer to Removal and Installation.

Disconnect low-pressure pipe from front expansion valve. Refer to Removal and Installation.

Disconnect high-pressure pipe from front expansion valve. Refer to Removal and Installation.

Remove instrument panel assembly and steering member as a set. Refer to Removal and Installation.

Remove instrument panel assembly from steering member. Refer to Removal and Installation.

Remove each duct.

• Side ventilator duct (RH and 2 LH). Refer to Removal and Installation.

• Center ventilator duct. Refer to Removal and Installation.

Disconnect harness connectors , , , and .

Remove front heater & cooling unit assembly fixing screw .

Remove front heater & cooling unit mounting bolts and front blower unit mounting bolts .

Remove front heater & cooling unit assembly and front blower unit assembly as a set.

CAUTION:

When removing front heater & cooling unit assembly, 2 workers are required to prevent it from dropping.

Remove each duct from front heater & cooling unit assembly.

• Side ventilator duct 1 LH. Refer to Removal and Installation.

• Front foot duct (RH and LH). Refer to Removal and Installation.

Remove front blower unit assembly from front heater & cooling unit assembly. Refer to Removal and Installation.

INSTALLATION

Note the following items, and then install in the reverse order of removal.

CAUTION:

• Use a refrigerant collecting equipment (for HFO-1234yf) to charge the refrigerant. Refer to Charge Refrigerant.

• Perform a check for refrigerant leakage when charging with refrigerant. Refer to Leak Test.

NOTE:

When filling radiator with engine coolant. Refer to ENGINE COOLANT : Refilling.

Front Evaporator

Removal and Installation

REMOVAL

Remove front heater & cooling unit assembly. Refer to Removal and Installation.

Remove front heater core. Refer to Removal and Installation.

Remove front expansion valve. Refer to Removal and Installation.

Disconnect front mode door motor harness connector .

Remove sub harness from front heater & cooling unit.

Disconnect front air mix door motor (driver side) harness connector .

Remove front heater & cooling unit fixing screws .

Disengage fixing pawls, and then remove front heater & cooling unit from front case assembly.

: Pawl

Remove intake sensor from front evaporator. Refer to Removal and Installation.

Remove front case upper fixing screws .

Disengage fixing pawls, and then remove front case upper from front case lower assembly.

: Pawl

Remove front evaporator from front case lower assembly.

INSTALLATION

Note the following items, and then install in the reverse order of removal.

CAUTION:

• The air conditioning evaporator should never be repaired or replaced with a part from another vehicle. To replace a damaged or leaking evaporator, use only a new genuine NISSAN replacement part or equivalent.

• After installing a new evaporator, adjust the compressor lubricant level. Refer to Lubricant Adjusting Procedure for Components Replacement Except A/C compressor.

• Perform a check for refrigerant leakage when charging with refrigerant. Refer to Leak Test.

NOTE:

This label indicates that the evaporator complies with SAE J2842.

Front Expansion Valve

Removal and Installation

REMOVAL

CAUTION:

When disconnect the A/C piping related parts, cap or wrap the joint of those parts with suitable material such as vinyl tape to avoid the entry of air.

Remove front heater & cooling unit assembly. Refer to Removal and Installation.

Remove cooler packing.

Remove cooler grommet.

Remove mounting bolts, and then remove front expansion valve.

INSTALLATION

Note the following items, and then install in the reverse order of removal.

CAUTION:

• To prevent leakage of refrigerant, replace the O-ring with a new one. Apply a coat of compressor oil to the O-ring prior to installation.

• Replace cooler packing with new one.

• Perform a check for refrigerant leakage when charging with refrigerant. Refer to Leak Test.

Front Heater Core

Removal and Installation

REMOVAL

Remove front heater & cooling unit assembly. Refer to Removal and Installation.

Disconnect front air mix door motor (passenger side) harness connector .

Remove sub harness from front case lower assembly.

Remove cooler packing.

Remove fixing screws , and then remove heater pipe support.

Remove front heater core.

INSTALLATION

Note the following item, and then install in the reverse order of removal.

CAUTION:

Replace cooler packing with new one.