AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) No Warm Air Comes Out

DESCRIPTION

If cool air blows from the registers regardless of the temperature setting of the air conditioning system, the following factors may be the cause.

Symptom Factor

  • No warm air comes out


    • (Blower control is normal)

  • Outlet air temperature does not increase


    • (Blower control is normal)

  • Engine coolant temperature (low)

  • Refrigerant volume (low)

  • No. 1 air conditioning radiator damper servo sub-assembly malfunction

  • Warm-up control

  • Blockage in heater radiator unit sub-assembly

  • Quick heater assembly malfunction*1

  • Heater radiator unit sub-assembly malfunction

  • Flow shutting valve (water by-pass hose assembly) malfunction*2

PROCEDURE


  1. CONFIRM MODEL

    Result
    Result Proceed to
    except A25A-FKS A
    for A25A-FKS B

    A

    GO TO STEP 3 Click here

    B

  2. CHECK FOR DTC


    1. Check for DTCs.


      Powertrain > Engine > Trouble Codes
      OK
      SFI system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO SFI SYSTEM for A25A-FKS (w/ Canister Pump Module): Click here
    GO TO SFI SYSTEM for A25A-FKS (w/o Canister Pump Module): Click here

    OK

  3. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List.

    5. Read the Data List according to the display on the GTS.


      Powertrain > Engine > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature Min.: -40°C (-40°F), Max.: 140°C (284°F) 75 to 100°C (167 to 212°F): After warming up

      This is the engine coolant temperature.

      Tech Tips


      • After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).

      • After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.

      • If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.

      • Check if the engine overheats if the value indicated is higher than 135°C (275°F).

      Powertrain > Engine > Data List
      Tester Display
      Coolant Temperature
      OK
      After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO COOLING SYSTEM for 2AR-FE: Click here
    GO TO COOLING SYSTEM for A25A-FKS: Click here
    GO TO COOLING SYSTEM for 6AR-FSE: Click here
    GO TO COOLING SYSTEM for 2GR-FKS: Click here

    OK

  4. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 165 to 257 pulses


        for RHD:

      • Operates between 255 to 347 pulses
      Air Mix Servo Targ Pulse(P) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 255 to 347 pulses


        for RHD:

      • Operates between 165 to 257 pulses
      Rear Air Mix Servo Targ Pulse No. 3 air conditioning radiator damper servo sub-assembly pulse

      Min.: 128

      Max.: 383

      • Operates between 165 to 257 pulses

      • *

      • *: for 3 Zone Type


      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(P)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Rear Air Mix Servo Targ Pulse
      OK
      Each damper servo motor operates.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR Click here

    OK

  5. CONFIRM MODEL

    Result
    Result Proceed to
    w/ Quick Heater A
    w/o Quick Heater B

    B

    REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY Click here

    A

  6. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test / Heater Active Level / Data List / Electric Heater Active Level.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Heater Active Level Quick heater assembly

      Min.: 0

      Max.: 2

      		 -

      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Electric Heater Active Level Actual electric heater operation level

      Min.: 0

      Max.: 2

      		 Actual operation level of electric heater displayed PTC heater circuit system malfunction

      Body Electrical > Air Conditioner > Active Test
      Active Test Display
      Heater Active Level
      Data List Display
      Electric Heater Active Level

    5. Check that the value of the Data List item Electric Heater Active Level changes in accordance with the set value of the Active Test item Heater Active Level.

      OK
      GTS Operation Data List (Electric Heater Active Level)
      0 to 2 0 to 2
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY Click here

    NG

    GO TO PTC HEATER CIRCUIT Click here