AIR CONDITIONING SYSTEM Weak Blower Output

DESCRIPTION

If the blower airflow volume is weak regardless of the integration control and panel assembly being normal, the following causes are possible.

Malfunction Status Factor

  • Blower airflow volume is continuously weak.

  • Blower airflow volume is sometimes weak.

  • Communication malfunction air conditioning amplifier assembly and blower with fan motor sub-assembly

  • Air conditioning amplifier assembly malfunction

  • Blower with fan motor sub-assembly malfunction

  • Clean air filter is clogging

  • Evaporator or heater core fin clogging

  • ECO drive mode function (air flow volume is restricted due to ECO drive mode being selected)

  • Aspirator dropped

PROCEDURE


  1. CHECK BLOWER FAN OPERATION


    1. Prepare the vehicle according to the table below. with the manual mode.

      Blower Switch Condition
      LO → HI

      • Temperature setting: Max. COOL

      • Mode switch: FACE

      • A/C Switch: OFF
      OK
      Airflow volme is changed.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO BLOWER MOTOR CIRCUIT Click here

    OK

  2. CHECK ECO DRIVE MODE OPERATION


    1. Confirm setup of the ECO drive mode and turn it off if it becomes ON.

      Tech Tips


      • When ECO drive mode is on, the air conditioning amplifier assembly ensures a minimum level of air conditioning control based on certain conditions, thereby contributing to improved fuel efficiency. Accordingly, explain to customers that the air volume will be weaker in these situations.

        Control
        Airflow Control Automatically switches the air inlet port to the internal air circulation mode when the outside air temperature is equal to or higher than a predetermined temperature and reduces the power consumption.
        Air Inlet Control Sets the blower level in AUTO mode lower than normal, and suppresses the power consumption.

      • If combination switch assembly is malfunctioning, perform diagnosis on the ECO switch circuit.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK CLEAN AIR FILTER


    1. Check the clean air filter by the visually confirm.

      OK
      The clean air filter is not dirty or clogging.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CLEAN AIR FILTER Click here

    OK

  4. CHECK NO. 1 COOLER THERMISTOR


    1. Check the installation condition of the No. 1 cooler thermistor.

      OK
      No. 1 coolter thermistor is intalled correctly.
      Result
      Proceed to
      OK
      NG

    NG

    REINSTALL NO. 1 COOLER THERMISTOR Click here

    OK

  5. CHECK ASPIRATOR


    1. Check the installation condition of the aspirator.

      OK
      Aspirator is intalled correctly.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR (HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR WAS CLOGGING)

    NG

    REINSTALL ASPIRATOR Click here