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Home >> Subaru >> 2022 >> Forester Wilderness >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Diagnostics) >> Diagnostics with Phenomenon >> Inspection >> Cold Air Does Not Come Out Even When The A/C Switch Is Pressed. The Glass Cannot Be Defogged. (Compressor Does Not Operate.)

Cold Air Does Not Come Out Even When The A/C Switch Is Pressed. The Glass Cannot Be Defogged. (Compressor Does Not Operate.)

Trouble symptom: 

Compressor does not operate after turning the A/C switch to ON and the fan dial to between minimum - maximum.

Trouble causes: 

Compressor failure

Wiring diagram: 

Air conditioning system Ref. to WIRING SYSTEM>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

G14415205Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to AIR CONDITIONER (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
  1. CHECK A/C CONTROL PANEL  .
    1. Leave the vehicle under the condition at ambient temperature of 15°C (59°F) or more.
    2. Start the engine.
    3. Turn the fan dial to the maximum position.
    4. Press the A/C switch.

    Is A/C indicator displayed on the A/C control panel?

    Yes  : Go to  2.

    No  : Replace the A/C control panel. Ref. to AIR CONDITIONER>CONTROL PANEL .

  2. CHECK VARIABLE FLOW CHANGE SOLENOID DUTY VALUE  .

    Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Air Conditioner]. Ref. to AIR CONDITIONER (DIAGNOSTICS)>DATA MONITOR .

    • Variable Flow Change Solenoid Duty

    Does the display indicate the value greater than 0%?

    Yes  : Go to  7.

    No  : Go to  3.

  3. CHECK EVAPORATOR SENSOR  .

    Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Air Conditioner]. Ref. to AIR CONDITIONER (DIAGNOSTICS)>DATA MONITOR .

    • Evaporator Temperature

    Does the display indicate 3°C or more?

    Yes  : Go to  5.

    No  : Go to  4.

  4. CHECK EVAPORATOR SENSOR  .

    Check the evaporator sensor. Ref. to AIR CONDITIONER>EVAPORATOR SENSOR .

    Is the check result OK?

    Yes  : Go to  5.

    No  : Replace the evaporator sensor. Ref. to AIR CONDITIONER>EVAPORATOR SENSOR .

  5. CHECK REFRIGERANT PRESSURE SENSOR  .

    Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Air Conditioner]. Ref. to AIR CONDITIONER (DIAGNOSTICS)>DATA MONITOR .

    • Refrigerant Pressure

    Does the display indicate 0.225 MPa - 2.94 MPa?

    Yes  : Go to  7.

    No  : Go to  6.

  6. CHECK AMOUNT OF REFRIGERANT PRESSURE  .

    Check the refrigerant pressure. Ref. to AIR CONDITIONER>REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET .

    Is the check result OK?

    Yes  : Go to  7.

    No  : Perform repair according to refrigerant pressure inspection.

  7. CHECK VARIABLE SOLENOID CIRCUIT  .
    1. Turn the A/C switch to ON.
    2. Turn the fan dial to the maximum position.
    3. Set the temperature control dial (without left/right independent air conditioning function) or temperature control dials (driver's side) and (passenger's side) (with left/right independent air conditioning function) to MAX COOL, and wait for 30 seconds or more.
    4. Read the DTC of [Air Conditioner] using the Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC B14A7 displayed? (Current code)

    Yes  : Perform the diagnosis for the displayed DTC B14A7.

    No  : Replace the compressor. Ref. to AIR CONDITIONER>COMPRESSOR .

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