Nissan Altima 2007-2012 Service Manual: Heater & cooling unit assembly

Removal and Installation

COMPONENTS

1. Steering member

2. Heater and cooling unit

3. Blower unit

REMOVAL

1. Discharge the refrigerant from the A/C system. Refer to HA-24, "HFC-134a (R-134a) Service Procedure".

2. Drain the engine coolant from the cooling system. Refer to CO-12, "Changing Engine Coolant" (QR25DE), CO-35, "Changing Engine Coolant" (VQ35DE).

3. Disconnect the negative battery terminal.

4. Remove the wiper motor and linkage. Refer to WW-116, "FRONT WIPER DRIVE ASSEMBLY : Removal and Installation".

5. Remove the upper cowl (for VQ35DE only). Refer to EXT-18, "Removal and Installation".

6. Remove the strut tower bar (for VQ35DE only). Refer to FSU-12, "Exploded View".

7. Remove the lower RH cowl (for VQ35DE only). Refer to EXT-18, "Removal and Installation".

8. Disconnect the heater hoses from the heater core pipes.

CAUTION: Cap or wrap the pipe joint with a suitable material such as vinyl tape to avoid the entry of contaminants into the system.

9. Disconnect the refrigerant lines from the expansion valve. Refer to HA-31, "Component".

CAUTION: Cap or wrap the line joint with a suitable material such as vinyl tape to avoid the entry of contaminants into the system.

10. Remove the instrument panel assembly. Refer to IP-12, "Removal and Installation".

11. Remove the steering column assembly. Refer to ST-14, "Removal and Installation".

12. Disconnect the drain hose.

13. Remove the heater and cooling unit assembly attached to the steering member as one assembly from the vehicle.

14. Remove the blower unit from the heater and cooling unit and steering member assembly.

15. Remove the heater and cooling unit from the steering member.

INSTALLATION

Installation is in the reverse order of removal.

• Fill the radiator with the specified water and coolant mixture. Refer to MA-12, "Fluids and Lubricants".

• Recharge the A/C system. Refer to HA-24, "HFC-134a (R-134a) Service Procedure".

    Intake sensor
    Removal and Installation REMOVAL 1. Remove the evaporator. Refer to VTL-20, "Removal and Installation". 2. Release the intake sensor clip and then remove the intake sensor. CAUTION: ...

    Blower unit
    Removal and Installation COMPONENTS 1. Heater and cooling unit 2. Blower unit Front REMOVAL 1. Remove the heater and cooling unit assembly. Refer to VTL-12, "Removal and Installation&q ...

    Other materials:

    BCM branch line circuit
    Diagnosis Procedure INSPECTION PROCEDURE 1.CHECK CONNECTOR 1. Turn the ignition switch OFF. 2. Disconnect the battery cable from the negative terminal. 3. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and connector side). Is the inspec ...

    Ducts, nozzles and grilles
    Components 1. Upper ventilator duct 2. Heater and cooling unit assembly 3. Connector duct (LH 4. Floor ventilator duct (LH) 5. Connector duct (center) 6. Rear floor duct (LH) 7. Rear ventilator duct (center) 8. Rear floor duct (RH) 9. Floor ventilator duct (RH) 10. Connector duct (RH) 1 ...

    Headlamp (HI) circuit
    Description The IPDM E/R (intelligent power distribution module engine room) controls the headlamp high relay based on inputs from the BCM over the CAN communication lines. When the headlamp high relay is energized, power flows through fuses 48 and 49, located in the IPDM E/R. Power then flo ...