AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) Weak Blower Output

DESCRIPTION

If the airflow from the front registers is weak regardless of the blower speed setting displayed on the air conditioning control assembly, the following factors may be the cause.

Symptom Factor

  • Airflow volume is constantly low

  • Airflow volume sometimes becomes low

  • Blower motor with fan sub-assembly malfunction

  • Clogged clean air filter

  • Clogged No. 1 evaporator sub-assembly or heater radiator unit sub-assembly fins

  • No. 1 cooler thermistor malfunction

PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. Operate the blower switch with the following conditions met and check that the airflow volume changes.

      Blower Speed Condition
      LO → HI

      • Temperature setting: MAX COLD

      • Air outlet mode: FACE

      • A/C switch: Off
      OK
      Airflow volume increases.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit) Click here

    OK

  2. CHECK CLEAN AIR FILTER


    1. Visually check the clean air filter.

      Click here

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

    NG

    REPLACE CLEAN AIR FILTER Click here

    OK

  3. CHECK NO. 1 COOLER THERMISTOR


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

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

    OK

    REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY Click here

    NG

    INSTALL NO. 1 COOLER THERMISTOR CORRECTLY Click here