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AIR CONDITIONING SYSTEM Weak Blower Output

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DTC Code DTC Name
  Weak Blower Output
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DESCRIPTION

If the blower airflow volume is weak regardless of the air conditioning control assembly being normal, the following causes are possible.

Symptom 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
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PROCEDURE


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    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 volume is changed.
      Result
      Result Proceed to
      OK A
      NG (for Front) B
      NG (for Rear) C

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    CHECK ECO DRIVE MODE OPERATION


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

      Tip:

      • 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 satellite switch set is malfunctioning, perform diagnosis on the ECO switch circuit.

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      Result
      Proceed to
      NEXT

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    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

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    CHECK NO. 1 COOLER THERMISTOR


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

      OK
      No. 1 cooler thermistor is installed correctly.
      Result
      Proceed to
      OK
      NG

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    CHECK ASPIRATOR


    1. Check the installation condition of the aspirator.

      OK
      Aspirator is installed 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 ASPIRATORClick here