Nissan Altima 2007-2012 Service Manual: Insufficient heating

Component Function Check

SYMPTOM: Insufficient heating

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE

1. Turn temperature control dial clockwise to maximum heat.

2. Check for hot air at discharge air outlets.

Can a symptom be duplicated? YES >> GO TO 3

NO >> GO TO 2

2. CHECK FOR ANY SYMPTOMS

Perform a complete operational check and check for any symptoms. Refer to HAC-102, "Description & Conditions".

Does another symptom exist? YES >> Refer to HAC-155, "Symptom Matrix Chart".

NO >> System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4. CHECK ENGINE COOLING SYSEM

1. Check for proper engine coolant level. Refer to CO-11, "System Inspection" (QR25DE) or CO-34, "System Inspection" (VQ35DE).

2. Check hoses for leaks or kinks.

3. Check radiator cap. Refer to CO-11, "System Inspection" (QR25DE) or CO-34, "System Inspection" (VQ35DE).

4. Check for air in cooling system.

>> GO TO 5

5. CHECK AIR MIX DOOR MOTOR OPERATION

Check and verify air mix door mechanism for smooth operation.

Does air mix door operate correctly? YES >> GO TO 6

NO >> Check the air mix door motor circuit. Refer to HAC-122, "Diagnosis Procedure".

6. CHECK AIR DUCTS

Check for disconnected or leaking air ducts.

Is the inspection result normal? YES >> GO TO 7

NO >> Repair all disconnected or leaking air ducts.

7. CHECK HEATER HOSE TEMPERATURES

1. Start engine and warm it up to normal operating temperature.

2. Touch both the inlet and outlet heater hoses.

Is the inspection result normal? YES >> Hot inlet hose and a warm outlet hose: GO TO 8

NO >> Both hoses warm: GO TO 9

8. CHECK ENGINE COOLANT SYSTEM

Check thermostat operation. Refer to CO-21, "Removal and Installation" (QR25DE) or CO-46, "Removal and Installation" (VQ35DE).

Is the inspection result normal? YES >> System OK.

NO >> Repair or replace as necessary.

9. CHECK HEATER HOSES

Check heater hoses for proper installation.

Is the inspection result normal? YES >> System OK.

NO >> 1. Back flush heater core.

2. Drain the water from the system.

3. Refill system with new engine coolant. Refer to CO-12, "Changing Engine Coolant" (QR25DE) or CO-35, "Changing Engine Coolant" (VQ35DE).

4. To retest GO TO 10

10. CHECK HEATER HOSE TEMPERATURES

1. Start engine and warm up to normal operating temperature.

2. Touch both the inlet and outlet heater hoses.

Is the inspection result normal? YES >> System OK.

NO >> Replace heater core Refer to VTL-22, "Removal and Installation".

    Insufficient cooling
    Component Function Check SYMPTOM: Insufficient cooling INSPECTION FLOW 1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE 1. Press the A/C switch. 2. Turn temperature contr ...

    Noise
    Component Function Check SYMPTOM: Noise INSPECTION FLOW *1 HAC-102, "Operational Check" *2 EM-16, "Checking Drive Belts" (QR25DE) or EM-121, "Checking Drive Belts" ...

    Other materials:

    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 ...

    U1000 can comm circuit
    Description CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control unit, and ea ...

    B2190, P1610 nats antenna amp
    Description Performs ID verification through BCM and keyfob when push-button ignition switch is pressed. Prohibits the release of steering lock or start of engine when an unregistered ID of keyfob is used. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PERFORM DTC CONFIRMA ...