AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) PROBLEM SYMPTOMS TABLE

Tech Tips


  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.


  1. VEHICLE CHECK ITEMS

    Tech Tips


    • You can reduce the number of systems to check by using the results of the following operation check

    • Perform the following checks based on Customer Feedback and the vehicle condition.

    • The customer's opinion may not be consistent with the actual problem (eg: the cooling performance of the air conditioner is bad → actually, the wind volume is weak). It is important to check the problem symptoms accurately and judge correctly based on various sources of information.

    • Judgment as to whether the air conditioner panel is normal or abnormal can be judged by checking if the indicator illuminates or turns off when the switch is operated.

    • If the performance of the air conditioner is poor or there is a foul odor, check for clogging in the clean air filter.

  2. AIR CONDITIONING CONTROL

    3. Symptom Suspected Area Link

    Air conditioning system cannot be operated using air conditioning control assembly


    • (With the exception of the switch indicators, no inputs are reflected when other switches operated)

    • Air conditioning amplifier assembly

    • Blower motor with fan sub-assembly

    • Air conditioning control assembly

    Click here

    Air conditioning system cannot be operated using air conditioning control assembly


    • (Air conditioning system display operates)

    		 Air conditioning control assembly

    Click here

    Air conditioning system cannot be operated using air conditioning control assembly immediately after starting the engine


    • (Air conditioning system display operates)

    • (A/C switch indicator does not illuminate)

    		 Refer to "INITIALIZATION"

    Click here

    A/C switch indicator does not illuminate

    • Air conditioning amplifier assembly

    • Air conditioning control assembly

    • A/C switch

    • A/C switch indicator

    • Servo motor

    • Damper and damper link

    • Refrigerant pressure

    • Ambient temperature

    Click here

  • COOLING FUNCTION

    Symptom Suspected Area Link

    No cool air comes out


    • (Blower control is normal)

    • Compressor assembly with pulley (compressor solenoid)

    • Refrigerant pressure

    • Refrigerant volume

    • Cooler condenser assembly

    • Cooling fan system

    • Damper and damper link

    • No. 1 cooler thermistor

    • High inlet air temperature

    Click here


    • Cooling effectiveness is poor

    • Cooling response is slow

    • Compressor assembly with pulley (compressor solenoid)

    • Refrigerant volume

    • Cooler condenser assembly

    • Cooling fan system

    • Damper and damper link

    • High inlet air temperature

    • Harness or connector

    Click here

  • HEATER FUNCTION

    Symptom Suspected Area Link

    • No warm air comes out

      (Blower control is normal)

    • Outlet air temperature does not increase

      (Blower control is normal)

    • Engine coolant temperature

    • No. 1 air conditioning radiator damper servo sub-assembly

    • Damper and damper link

    • Warm-up Control

    • Blockage in heater radiator unit sub-assembly

    • Heater radiator unit sub-assembly

    • Flow shutting valve (water by-pass hose assembly)*

    Click here


  • BLOWER CONTROL

    Symptom Suspected Area Link

    Blower motor does not operate at all


    • (Air does not blow from registers)

    • Blower motor with fan sub-assembly

    • Air conditioning amplifier assembly

    • Engine coolant temperature sensor

    • Harness or connector

    Click here

    Airflow volume cannot be changed

    • Air conditioning amplifier assembly

    • Blower motor with fan sub-assembly

    • Harness or connector

    Click here


    • Airflow volume is constantly low

    • Airflow volume sometimes becomes low

    • Blower motor with fan sub-assembly

    • Clean air filter

    • No. 1 evaporator sub-assembly or heater radiator unit sub-assembly fins

    • No. 1 cooler thermistor

    Click here

  • AIR INLET CONTROL

    Symptom Suspected Area Link

    • Air inlet mode changes between recirculation/fresh randomly

    • Recirculation/fresh switch indicator is blinking

    • Ambient air temperature

    • Refrigerant pressure

    • Air conditioner pressure sensor circuit

    • Engine coolant temperature

    Click here


    • Air inlet mode cannot be changed between recirculation/fresh

    • Air inlet mode does not change between recirculation/fresh automatically

    • No. 1 blower damper servo sub-assembly

    • Damper link

    • Air inlet damper mechanically locked

    • Engine coolant temperature

    • Air conditioner unit assembly

    Click here

  • AIR OUTLET CONTROL

    Symptom Suspected Area Link
    Air outlet mode cannot be changed (air outlet display changes)

    • No. 1 blower damper servo sub-assembly

    • Damper link disconnection

    • Air conditioner unit assembly

    Click here

    Air outlet mode cannot be changed (air outlet display does not change) Air conditioning control assembly

    Click here

  • DEFROSTER CONTROL

    Symptom Suspected Area Link
    Windshield frequently fogs up

    • Compressor assembly with pulley (compressor solenoid)

    • Refrigerant volume

    • Cooler expansion valve

    • No. 1 air conditioning radiator damper servo sub-assembly

    • Damper and damper link

    Click here