Subaru Legacy (2005 year). Manual - part 881
AC(diag)-41
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Diagnostics with Phenomenon
9. Diagnostics with Phenomenon
A: INSPECTION
Symptom
Problem parts
A/C system fails to operate.
• Fuse (M/B No. 8, F/B No. 22, 31)
• Connector (Poor contact)
• Ground
• Auto A/C control module
• Blower fan motor
• Blower fan relay
• A/C Relay
• Compressor (Magnet clutch)
• Compressor (Lock sensor): 3.0 L model
• Evaporator sensor
Fuse is blown out.
• Fuse (M/B No. 8, F/B No. 22, 31)
• Connector (Poor contact)
Illumination cannot dim.
• Fuse (M/B No. 8, F/B No. 22, 31)
• Connector (Poor contact)
• Auto A/C control module
Blower fan does not rotate or fan speed cannot be controlled.
• Fuse (M/B No. 8, F/B No. 22, 31)
• Connector (Poor contact)
• Ground
• Auto A/C control module
• Blower fan motor
• Blower fan relay
Unable to switch suction vents.
• Connector (Poor contact)
• Auto A/C control module
• Intake door actuator
Unable to switch blow vents.
• Connector (Poor contact)
• Auto A/C control module
• Mode door actuator
Compartment temperature does not increase. (No hot air is dis-
charged.)
• Connector (Poor contact)
• Auto A/C control module
• Air mix door actuator
• In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
• In-vehicle sensor aspirator hose
Compartment temperature does not decrease. (No cool air is
discharged.)
• Connector (Poor contact)
• Auto A/C control module
• Air mix door actuator
• A/C Relay
• Compressor (Magnet clutch)
• Radiator fan motor
• Radiator fan relay
• In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
• In-vehicle sensor aspirator hose
Compartment temperature is higher or lower than setting tem-
perature.
• Auto A/C control module
• Air mix door actuator
• In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
• In-vehicle sensor aspirator hose
Compartment temperature does not quickly respond to setting
temperature.
• Air mix door actuator
• In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
• In-vehicle sensor aspirator hose
Radiator fan does not rotate during A/C operation.
• Radiator fan motor
• Radiator fan relay