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Inspection Flow

WARNING: This page is about a different car, the 2018 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
  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 Work Procedure .

    Does another symptom exist?

    YES

    Refer to Symptom Table .

    NO

    System OK.

  3. CHECK FOR SERVICE BULLETINS 

    Check for any service bulletins.

    GO TO 4

  4. CHECK ENGINE COOLING SYSTEM 
    1. Check for proper engine coolant level. Refer to System Inspection .
    2. Check hoses for leaks or kinks.
    3. Check radiator cap. Refer to System Inspection .
    4. Check for air in cooling system.

    GO TO 5

  5. CHECK AIR MIX DOOR MOTOR RH 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 RH circuit. Refer to 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. The inlet hose should be hot and the outlet hose should be warm.

    Is the inspection result normal?

    YES

    GO TO 8

    NO

    Both hoses warm: GO TO 9

  8. CHECK ENGINE COOLANT SYSTEM 

    Check thermostat operation. Refer to Inspection .

    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 Changing Engine Coolant .
    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. 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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