Trouble causes

Airflow capacity failure
Coolant failure
UART communication failure
A/C control panel failure
Air mix actuator (driver's) failure
Air mix actuator (passenger's) failure (with left/right independent air conditioner only)
Rear vent actuator failure (with rear seat air conditioning only)
Intake door actuator failure
Evaporator sensor failure (vehicles with automatic air conditioner only)
In-vehicle sensor failure (vehicles with automatic air conditioner only)
Ambient sensor failure (vehicles with automatic air conditioner only)
Sunload sensor failure (vehicles with automatic air conditioner only)

Step	Check	Yes	No
1 CHECK MAX HOT. Set the A/C control panel switch as described below. Temperature control switch: MAX HOT FRESH/RECIRC switch: FRESH Mode switch: HEAT A/C switch: OFF	Does no warm air come out?	Go to step 2 .	Go to step 4 .
2 CHECK AIRFLOW CAPACITY. Check the airflow capacity. Refer to AIR DOES NOT COME OUT, OR AIRFLOW CAPACITY IS INSUFFICIENT .	Is the airflow capacity normal?	Go to step 3 .	Perform repair according to inspection procedure.
3 CHECK ENGINE COOLANT. Check engine coolant amount.	Is the engine coolant amount normal?	For vehicles with automatic air conditioner Go to step 4 . For vehicles with manual air conditioner Go to step 6 .	Fill engine coolant. If there is coolant leakage, repair the leaks according to Engine Cooling System Trouble in General. Refer to ENGINE COOLING SYSTEM TROUBLE IN GENERAL (H4DO) or ENGINE COOLING SYSTEM TROUBLE IN GENERAL (H6DO).
4 CHECK A/C CONTROL PANEL (VEHICLES WITH AUTOMATIC AIR CONDITIONER). Continue clicking the temperature control switch DOWN (driver's) and (passenger's). Using Subaru Select Monitor, display the following data in "Read Current Data". Heater Control Panel Setting Value (Driver's) Heater Control Panel Setting Value (Passenger's) Rear Vent Actuator Position Target (with rear seat air conditioning only)	Do "Heater Control Panel Setting Value (Driver's)" and "Heater Control Panel Setting Value (Passenger's)" indicate "60"? In addition, does "Rear Vent Actuator Position Target" indicate "74.5"?	Go to step 5 .	Replace the A/C control panel. Refer to REMOVAL .
5 CHECK A/C CONTROL PANEL (VEHICLES WITH AUTOMATIC AIR CONDITIONER). Continue clicking the temperature control switch Δ (driver's). Using Subaru Select Monitor, display the following data in "Read Current Data". Heater Control Panel Setting Value (Driver's) Heater Control Panel Setting Value (Passenger's) Rear Vent Actuator Position Target (with rear seat air conditioning only)	Do "Heater Control Panel Setting Value (Driver's)" and "Heater Control Panel Setting Value (Passenger's)" indicate "90"? In addition, does "Rear Vent Actuator Position Target" indicate "-5.5"?	Go to step 8 .	Replace the A/C control panel. Refer to REMOVAL .
6 CHECK A/C CONTROL PANEL (VEHICLES WITH MANUAL AIR CONDITIONER). Set the temperature control switch dial to MAX COOL. Using Subaru Select Monitor, display the following data in "Read Current Data". Target air mix door actuator position (driver's side)	Does "Target air mix door actuator position (driver's side)" indicate "0%"?	Go to step 7 .	Replace the A/C control panel. Refer to REMOVAL .
7 CHECK A/C CONTROL PANEL (VEHICLES WITH MANUAL AIR CONDITIONER). Set the temperature control switch dial to MAX HOT. Using Subaru Select Monitor, display the following data in "Read Current Data". Target air mix door actuator position (driver's side)	Does "Target air mix door actuator position (driver's side)" indicate "100%"?	Go to step 8 .	Replace the A/C control panel. Refer to REMOVAL .
8 CHECK DTC. Turn the ignition switch to ON. Set the temperature control switch to MAX COOL, and wait for 16 seconds or more. (For vehicles with left/right independent air conditioner, perform setting on both sides.) Read the DTC using Subaru Select Monitor.	Are DTCs B1610, B1611, B1612, B1613, B1614, B1615, B1630, B1631 and B1632 displayed?	Perform the diagnosis according to DTC.	Go to step 9 .
9 CHECK DTC. Turn the ignition switch to ON. Set the temperature control switch to MAX HOT, and wait for 16 seconds or more. (For vehicles with left/right independent air conditioner, perform setting on both sides.) Read the DTC using Subaru Select Monitor.	Are DTCs B1610, B1611, B1612, B1613, B1614, B1615, B1630, B1631 and B1632 displayed?	Perform the diagnosis according to DTC.	Go to step 10 .
10 CHECK INTAKE DOOR ACTUATOR. Visually check the intake door actuator operation.	Is the intake door actuator normal?	Go to step 11 .	Check the intake door actuator. Refer to UNABLE TO SWITCH SUCTION VENTS .
11 CHECK EVAPORATOR SENSOR UNIT (VEHICLES WITH AUTOMATIC AIR CONDITIONER ONLY). Perform the inspection of evaporator sensor unit. Refer to INSPECTION .	Is the evaporator sensor normal?	Go to step 12 .	Replace the evaporator sensor. Refer to REMOVAL .
12 CHECK IN-VEHICLE SENSOR UNIT (VEHICLES WITH AUTOMATIC AIR CONDITIONER ONLY). Check in-vehicle sensor circuit. Refer to INSPECTION .	Is the in-vehicle sensor circuit normal?	Go to step 13 .	Replace the in-vehicle sensor. Refer to REMOVAL .
13 CHECK AMBIENT SENSOR (VEHICLES WITH AUTOMATIC AIR CONDITIONER ONLY). Check the ambient sensor. Refer to INSPECTION .	Is the ambient sensor normal?	Go to step 14 .	Replace the ambient sensor. Refer to REMOVAL .
14 CHECK SUNLOAD SENSOR UNIT (VEHICLES WITH AUTOMATIC AIR CONDITIONER ONLY). Check the sunload sensor unit. Refer to INSPECTION .	Is the sunload sensor normal?	System is normal.	Replace the sunload sensor. Refer to REMOVAL .