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

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.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK A/C CONTROL PANEL  .
   1. Leave the vehicle under the condition at ambient temperature of 15°C (59°F) or more.
   2. Turn the ignition switch to ON.
   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? (Current malfunction)

   Yes  : Go to  2.

   No  : Replace the A/C control panel. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>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) (EXCEPT FOR HEV)>DATA MONITOR .

   • Variable Flow Change Solenoid Duty

   Does the display indicate the value greater than zero?

   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) (EXCEPT FOR HEV)>DATA MONITOR .

   • Evaporator Temperature

   Does the data indicate -0.5[°C] or more?

   Yes  : Go to  5.

   No  : Go to  4.

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 .

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) (EXCEPT FOR HEV)>DATA MONITOR .

   • Refrigerant Pressure

   Does the display indicate 0.23 - 2.81 [MPa]?

   Yes  : Go to  7.

   No  : Go to  6.

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.

7. 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 .

   Yes  : Go to  8.

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 DTC B14A7 displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed DTC B14A7.

   No  : Replace the compressor. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>COMPRESSOR .