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Inspection Flow

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE 
    1. Rotate blower control dial clockwise.
    2. Turn the temperature control dial clockwise to maximum heat.
    3. Check for hot air at discharge air outlets.

    Can the symptom be duplicated? 

    YES: GO TO 2.

    NO: Perform complete operational check (front). Refer to "OPERATIONAL CHECK (FRONT) ".

  2. CHECK FOR SERVICE BULLETINS 

    Check for any service bulletins.

    GO TO 3.

  3. CHECK ENGINE COOLING SYSTEM 
    1. Check for proper engine coolant level. Refer to "CHECKING RESERVOIR LEVEL ".
    2. Check hoses for leaks or kinks.
    3. Check radiator cap. Refer to "CHECKING RESERVOIR CAP ".
    4. Check for air in cooling system.

      GO TO 4.

  4. CHECK AIR MIX DOOR OPERATION 

    Check the operation of the air mix door.

    OK or NG 

    OK: GO TO 5.

    NG: Check the air mix door motor circuit. Refer to "AIR MIX DOOR MOTOR CIRCUIT ".

  5. CHECK AIR DUCTS 

    Check for disconnected or leaking air ducts.

    OK or NG 

    OK: GO TO 6.

    NG: Repair all disconnected or leaking air ducts.

  6. CHECK HEATER HOSE TEMPERATURES 
    1. Start engine and warm it up to normal operating temperature.
    2. Touch both the inlet and outlet heater hoses.

    OK or NG 

    OK: Hot inlet hose and a warm outlet hose: GO TO 7.

    NG: Both hoses warm: GO TO  8.

  7. CHECK ENGINE COOLANT SYSTEM 

    Check engine coolant temperature sensor. Refer to "DTC P0117, P0118 ECT SENSOR ".

    OK or NG 

    OK: System OK.

    NG: Repair or replace as necessary. Retest.

  8. CHECK HEATER HOSES 

    Check heater hoses for proper installation.

    OK or NG 

    OK: System OK.

    NG:

    1. Back flush heater core.
    2. Drain the water from the system.
    3. Refill system with new engine coolant. Refer to "CHANGING ENGINE COOLANT ".
    4. GO TO 9 to retest.
  9. CHECK HEATER HOSE TEMPERATURES 
    1. Start engine and warm it up to normal operating temperature.
    2. Touch both the inlet and outlet heater hoses.

    OK or NG 

    OK: System OK.

    NG: Replace heater core. Refer to "HEATER CORE ".

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