Warm Air Not Emitted

Trouble symptom: 

Warm air not emitted.

Trouble causes: 

• Airflow capacity failure
• Coolant level failure
• CAN communication failure
• A/C control panel failure
• Air mix actuator failure
• Intake door actuator failure
• Evaporator sensor failure
• In-vehicle sensor failure
• Ambient sensor failure
• Sunload sensor failure
• Heat pump system failure
• UART communication failure

Wiring diagram: 

Air conditioning system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK MAX HOT  .
   1. Leave the vehicle under the condition at ambient temperature of -10°C (14°F) or more.
   2. Turn to READY ON.
   3. Set the A/C control panel dials or switch as follows.

      Temperature control dial: MAX HOT

      FRESH/RECIRC switch: FRESH

      Mode dial: HEAT

      A/C switch: OFF

   Does it fail to blow the hot air?

   Yes  : Go to  2.

   No  : Go to  4.

2. CHECK AIRFLOW CAPACITY  .

   Check the airflow capacity. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>AIR DOES NOT COME OUT. OR AIRFLOW CAPACITY IS INSUFFICIENT (BLOWER MOTOR DOES NOT ROTATE) .

   Is the check result OK?

   Yes  : Go to  3.

   No  : Perform repair according to inspection procedure.

3. CHECK AMOUNT OF REFRIGERANT PRESSURE  .

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

   Is the check result OK?

   Yes  : Go to  4.

   No  : Perform repair according to refrigerant pressure inspection.

4. CHECK A/C CONTROL PANEL  .
   1. Set the temperature control dial to MAX COOL.
   2. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Air Conditioner]. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DATA MONITOR .
      • Heater Control Panel Setting Value (Driver's)

   Does [Heater Control Panel Setting Value (Driver's)] indicate "60"*1?

   (*1: For the 72°F center specification. For the 25°C center specification, the value is 18)

   Yes  : Go to  5.

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

5. CHECK A/C CONTROL PANEL 
   1. Set the temperature control dial to MAX HOT.
   2. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Air Conditioner]. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DATA MONITOR .
      • Heater Control Panel Setting Value (Driver's)

   Does [Heater Control Panel Setting Value (Driver's)] indicate "85"*2?

   (*2: For the 72°F center specification. For the 25°C center specification, the value is 32)

   Yes  : Go to  6.

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

6. CHECK DTC  .
   1. Turn to READY ON.
   2. Turn the temperature control dial at MAX COOL and leave for 16 seconds or more.
   3. Read the following DTCs using Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
      • Air Conditioner
      • P-HEV Hybrid Powertrain Control

   Are any DTCs displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed DTCs. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV HYBRID POWERTRAIN CONTROLS DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   No  : Go to  7.

7. CHECK DTC  .
   1. Turn the temperature control dial at MAX HOT and leave for 16 seconds or more.
   2. Read the following DTCs using Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
      • Air Conditioner
      • P-HEV Hybrid Powertrain Control

   Are any DTCs displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed DTCs. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   No  : Go to  8.

8. CHECK INTAKE DOOR ACTUATOR  .

   Visually check the intake door actuator operation.

   Is the check result OK?

   Yes  : Go to  9.

   No  : Check the intake door actuator. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>UNABLE TO SWITCH SUCTION VENTS .

9. CHECK EVAPORATOR SENSOR  .

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

   • Evaporator Temperature

   Does the display indicate -0.5[°C] (31°F) or more?

   Yes  : Go to  11.

   No  : Go to  10.

10. CHECK EVAPORATOR SENSOR UNIT  .

    Perform the inspection of evaporator sensor unit. Ref. to AIR CONDITIONER (HEV)>EVAPORATOR SENSOR .

    Is the check result OK?

    Yes  : Go to  11.

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

11. CHECK IN-VEHICLE SENSOR UNIT 

    Check in-vehicle sensor. Ref. to AIR CONDITIONER (HEV)>IN-VEHICLE SENSOR (AUTO A/C MODEL) .

    Is the check result OK?

    Yes  : Go to  12.

    No  : Replace the in-vehicle sensor. Ref. to AIR CONDITIONER (HEV)>IN-VEHICLE SENSOR (AUTO A/C MODEL) .

12. CHECK AMBIENT SENSOR UNIT  .

    Check the ambient sensor. Ref. to AIR CONDITIONER (HEV)>AMBIENT SENSOR .

    Is the check result OK?

    Yes  : Go to  13.

    No  : Replace the ambient sensor. Ref. to AIR CONDITIONER (HEV)>AMBIENT SENSOR .

13. CHECK SUNLOAD SENSOR UNIT  .

    Check the sunload sensor unit. Ref. to AIR CONDITIONER (HEV)>SUNLOAD SENSOR (AUTO A/C MODEL) .

    Is the check result OK?

    Yes  : Go to  14.

    No  : Replace the sunload sensor. Ref. to AIR CONDITIONER (HEV)>SUNLOAD SENSOR (AUTO A/C MODEL) .

14. CHECK HEAT PUMP CONTROL MODULE  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the heat pump Control Module connector.
    3. Using a tester, measure the voltage between the heat pump Control Module connector and chassis ground.

       Connector & terminal 

       (i365) No. 40 (+) - Chassis ground (-):

    Is the voltage 11 - 14 V or more?

    Yes  : Go to  15.

    No  : Repair or replace the open, short circuit of the harness.

15. CHECK HEAT PUMP CONTROL MODULE  .

    Replace the heat pump Control Module with a properly functioning part. Ref. to AIR CONDITIONER (HEV)>CONTROL UNIT .

    Is the faulty phenomenon reproduced?

    Yes  : Go to  16.

    No  : Malfunction occurred in the heat pump Control Module.

16. PERFORM UNIT INSPECTION OF HEAT PUMP SYSTEM PARTS  .

    Perform unit inspection of the following parts.

    • Low pressure solenoid valve Ref. to AIR CONDITIONER (HEV)>SOLENOID VALVE>INSPECTION .
    • High pressure solenoid valve Ref. to AIR CONDITIONER (HEV)>SOLENOID VALVE>INSPECTION .
    • Heating expansion valve Ref. to AIR CONDITIONER (HEV)>EXPANSION VALVE>INSPECTION .
    • Cooling expansion valve Ref. to AIR CONDITIONER (HEV)>EXPANSION VALVE>INSPECTION .
    • Interior condenser exit temperature sensor Ref. to AIR CONDITIONER (HEV)>PIPE TEMPERATURE SENSOR>INSPECTION .
    • Exterior condenser exit temperature sensor Ref. to AIR CONDITIONER (HEV)>PIPE TEMPERATURE SENSOR>INSPECTION .
    • Discharge temperature sensor Ref. to AIR CONDITIONER (HEV)>PIPE TEMPERATURE SENSOR>INSPECTION .
    • Evaporator exit temperature sensor Ref. to AIR CONDITIONER (HEV)>PIPE TEMPERATURE SENSOR>INSPECTION .

    Is the check result OK?

    Yes  : The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

    NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

    No  : Repair it according to unit inspection of parts.