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Inspection Flow

WARNING: This page is about a different car, the 2012 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.

      Is the inspection result normal? 

      YES: GO TO 2.

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

  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.
    2. Check hoses for leaks or kinks.
    3. Check radiator cap. Refer to "SYSTEM INSPECTION ".
    4. Check for air in cooling system.

      GO TO 4.

  4. CHECK AIR MIX DOOR OPERATION

    Check the operation of the air mix door.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Check the air mix door motor circuit. Refer to "AIR MIX DOOR MOTOR COMPONENT FUNCTION CHECK ".

  5. CHECK AIR DUCTS

    Check for disconnected or leaking air ducts.

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: 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. The inlet hose should be hot and the outlet hose should be warm.

      Is the inspection result normal? 

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

      NO: Both hoses warm: GO TO  8.

  7. CHECK ENGINE COOLANT SYSTEM

    Check engine coolant temperature sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: System OK.

    NO: Repair or replace as necessary. Retest.

  8. 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 "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. The inlet hose should be hot and the outlet hose should be warm.

      Is the inspection result normal? 

      YES: System OK.

      NO: Replace heater core. Refer to "REMOVAL AND INSTALLATION ".

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