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

WARNING: This page is about a different variant/trim than selected.

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 (IMPREZA MODEL)> AIR CONDITIONING SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))> AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description" Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)> GENERAL DESCRIPTION> CAUTION .

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 (EXCEPT FOR HEV)> CONTROL PANEL .
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) (EXCEPT FOR HEV)> DATA MONITOR .
- Variable Flow Change Solenoid Duty
Does the display indicate the value greater than 0%?

Yes: Go to 7.

No: Go to 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) (EXCEPT FOR HEV)> DATA MONITOR .
- Evaporator Temperature
Does the data indicate -0.5°C or more?

Yes: Go to 5.

No: Go to 4.
CHECK EVAPORATOR SENSOR .
Check the evaporator sensor Ref. to AIR CONDITIONER (EXCEPT FOR HEV)> EVAPORATOR SENSOR .

Is the check result OK?

Yes: Go to 5.

No: Replace the evaporator sensor. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)> EVAPORATOR SENSOR .
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) (EXCEPT FOR HEV)> DATA MONITOR .
- Refrigerant Pressure
Does the display indicate 0.23 - 2.81 MPa?

Yes: Go to 7.

No: Go to 6.
CHECK AMOUNT OF REFRIGERANT PRESSURE .
Check the refrigerant pressure. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)> REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET .

Is the check result OK?

Yes: Go to 7.

No: Perform repair according to refrigerant pressure inspection.
CHECK FLOW SENSOR CIRCUIT .
1. Turn the ignition switch to ON.
2. Wait at least 1 second.
3. Read the DTC of [Air Conditioner] using the Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)> DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B14A5 or B14A6 displayed? (Current malfunction)

Yes: Perform the diagnosis for the displayed DTC B14A5 or B14A6. Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)> DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B14A5: REFRIGERANT FLOW SENSOR CIRCUIT OPEN . Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)> DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B14A6: REFRIGERANT FLOW SENSOR CIRCUIT SHORT-CIRCUIT .

No: Go to 8.
CHECK VARIABLE SOLENOID CIRCUIT .
1. Start the engine.
2. Turn the A/C switch to ON.
3. Turn the fan dial to the maximum position.
4. Set the temperature control dial to MAX COOL (both dials for the models equipped with left/right independent air conditioning function) and wait for 30 seconds or more.
5. Read the DTC of [Air Conditioner] using the Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)> DIAGNOSTIC TROUBLE CODE (DTC) .
  Is PTC B14A7 displayed? (Current malfunction)
  
  Yes: Perform the diagnosis for the displayed PTC B14A7.
  
  No: Replace the compressor Ref. to AIR CONDITIONER (EXCEPT FOR HEV)> COMPRESSOR .