A/C System Symptom Diagnosis

Precautions: General safety (00)

Condition	Possible Cause	Action
Blower motor does not operate	Blown fuse	Check related fuses, and then check for short circuit to ground.
	Faulty blower motor relay	Check blower motor relay.
	Faulty blower motor resistor	Check blower motor resistor.
	Faulty blower speed selector	Check blower speed selector.
	Faulty blower motor	Check blower motor.
	Foreign material is present	Remove foreign material.
	Faulty wiring or grounding	Repair wiring.
Air outlet ports do not change or do not agree with air flow selector’s position even if air flow selector is changed	Broken or bent air flow control cable	Check air flow control cable.
	Faulty air flow selector	Check air flow selector.
	Incorrect installation of air flow control cable	Check position of cable and adjust it if necessary.
	Leaky or clogged air ducts	Repair air ducts.
	Broken air flow control door assembly	Repair air flow control door assembly.
Air intake door does not change even if air intake mode is changed	Blown fuse	Check related fuses, and then check for short circuit to ground.
	Faulty air intake control actuator	Check air intake control actuator.
	Faulty air intake switch	Check air intake switch.
	Broken air intake door	Repair air intake door.
	Faulty wiring or grounding	Repair wiring.
Warm air does not come out or insufficient heating (Faulty temperature control)	Broken or bent temperature control cable	Check temperature control cable.
	Faulty temperature selector	Check temperature selector.
	Incorrect installation of temperature control cable	Check position of cable and adjust it if necessary.
	Clogged air ducts	Repair air ducts.
	Faulty additional heater system (if equipped)	Check additional heater system.
	Faulty thermostat (Petrol model)	Check thermostat.
	Faulty ECT sensor	Check ECT sensor. •Petrol model: •Diesel model:
	Leaky or clogged heater hoses	Replace heater hoses.
	Broken temperature control door assembly	Repair temperature control door assembly.
	Leaky or clogged heater core	Replace heater core.
No cool air comes out (A/C compressor does not operate)	Blown fuse	Check related fuses, and then check for short circuit to ground.
	Faulty A/C compressor relay	Check A/C compressor relay.
	Faulty A/C switch	Check A/C switch.
	Faulty blower speed selector	Check blower speed selector.
	Faulty BCM	Check BCM.
	Faulty ESP^®	Check ESP^® control module.
	Faulty ECM and its circuit	Check ECM.
	Faulty magnet clutch (petrol model)	Check magnet clutch.
	Faulty compressor pulley (diesel model)	Check compressor pulley.
	Faulty compressor ON/OFF valve (diesel model)	Check compressor ON/OFF valve.
	Loose or broken compressor drive belt (petrol model)	Check compressor drive belt.
	Loose or broken generator drive belt (diesel model)	Check generator drive belt.
	Faulty compressor	Check compressor.
	Faulty ECT sensor	Check ECT sensor. •Petrol model: •Diesel model:
	No refrigerant	Check amount of refrigerant and system for leakage. Recover refrigerant, evacuate and charge A/C system.
	Faulty A/C refrigerant pressure sensor	Check A/C refrigerant pressure sensor.
	Faulty evaporator temperature sensor	Check evaporator temperature sensor.
	Faulty HVAC control module	Check HVAC control module.
	Faulty wiring or grounding	Repair wiring.
No cool air comes out (radiator cooling fan motor does not operate)	Blown fuse	Check related fuses, and then check for short circuit to ground.
	Faulty radiator cooling fan relay	Check radiator cooling fan relay.
	Faulty radiator cooling fan motor	Check radiator cooling fan motor. •Petrol model: •Diesel model:
	Faulty ECM and its circuit	Check ECM.
	Faulty wiring or grounding	Repair wiring.
Cool air does not come out or insufficient cooling (A/C compressor in normal operation)	Faulty blower motor	Check blower motor.
	Air leakage from HVAC unit or air duct	Repair HVAC unit or air duct.
	Loose or broken compressor drive belt (petrol model)	Check compressor drive belt.
	Loose or broken generator drive belt (diesel model)	Check generator drive belt.
	Faulty magnet clutch (petrol model)	Check magnet clutch.
	Faulty compressor pulley (diesel model)	Check compressor pulley.
	Faulty compressor ON/OFF valve (diesel model)	Check compressor ON/OFF valve.
	Faulty compressor	Check compressor.
	Faulty expansion valve	Check expansion valve.
	Clogged desiccant	Check desiccant and cap.
	Faulty heater and ventilation system	Check HVAC unit.
	Insufficient or excessive charge of refrigerant	Check amount of refrigerant and system for leakage.
	Excessive compressor oil in A/C system	Drain excessive compressor oil from A/C system circuit and compressor.
	Clogged condenser	Check condenser.
	Clogged or frosted evaporator	Check evaporator and evaporator temperature sensor. •Evaporator: •Evaporator temperature sensor:
	Faulty evaporator temperature sensor	Check evaporator temperature sensor.
	Air in A/C system	Replace condenser, and then evacuate and charge A/C system with refrigerant.
Cool air does not come out intermittently	Faulty magnet clutch (petrol model)	Check magnet clutch.
	Faulty compressor pulley (diesel model)	Check compressor pulley.
	Faulty compressor ON/OFF valve (diesel model)	Check compressor ON/OFF valve.
	Excessive amount of refrigerant	Check the amount of refrigerant.
	Faulty expansion valve	Check expansion valve.
	Faulty evaporator temperature sensor	Check evaporator temperature sensor.
	Excessive moisture in A/C system	Replace condenser, and then evacuate and charge A/C system.
	Faulty wiring connection	Repair wiring.
Cool air comes out only at high speed	Loose compressor drive belt (petrol model)	Check compressor drive belt.
	Loose or broken generator drive belt (diesel model)	Check generator drive belt.
	Faulty compressor	Check compressor.
	Clogged condenser	Check condenser.
	Insufficient charge of refrigerant	Check amount of refrigerant and system for leakage.
	Air in A/C system	Replace condenser, and then evacuate and charge A/C system with refrigerant.
Cool air does not come out only at high speed	Excessive amount of refrigerant	Check amount of refrigerant.
Cool air does not come out only at high speed	Frosted evaporator	Check evaporator and evaporator temperature sensor. •Evaporator: •Evaporator temperature sensor:
Insufficient cool air flow	Faulty blower motor	Check blower motor.
	Air leakage from HVAC unit or air duct	Repair HVAC unit or air duct.
	Clogged or frosted evaporator	Check evaporator and evaporator temperature sensor. •Evaporator: •Evaporator temperature sensor:
	Faulty wiring or grounding	Repair wiring.
Heating performance is poor (for additional heater system)	Blown fuse	Check related fuses and check for short circuit to ground.
	Faulty additional heater relays	Check additional heater relays.
	Faulty max hot switch	Check max hot switch.
	Faulty additional heater	Check additional heater.
	Faulty ECM and its circuit	Check ECM.
	Faulty wiring or grounding	Repair wiring.