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Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in order If necessary, replace these parts.

PROBLEM SYMPTOMS TABLE - AIR CONDITIONING SYSTEM

Symptom Suspect Area
Whole functions of A/C system do not operate
  1. A/C Fuse
  2. A/C control assembly
No blower operation
  1. Heater main relay
  2. Blower motor
  3. Blower motor control relay
  4. A/C control assembly
  5. Wire harness
No blower control
  1. Blower motor
  2. Blower motor control relay
  3. A/C control assembly
  4. Wire harness
Insufficient air out
  1. Blower motor
No cool air comes out
  1. Refrigerant volume
  2. Drive belt
  3. Refrigerant pressure
  4. Compressor
  5. Pressure switch
  6. Igniter circuit
  7. Air mix servomotor
  8. Room temp, sensor
  9. Ambient temp, sensor
  10. A/C control assembly
  11. Wire harness
No warm air comes out
  1. Engine coolant volume
  2. Air mix servomotor
  3. Ambient temp, sensor
  4. Room temp, sensor
  5. A/C control assembly
  6. Heater radiator
Out put air is warmer or cooler than the set temperature or response is slow
  1. Refrigerant volume
  2. Engine coolant volume
  3. Drive belt
  4. Refrigerant pressure
  5. Condenser fan
  6. Ambient temp, sensor
  7. Evaporator temp, sensor
  8. Solar sensor
  9. Air mix servomotor
  10. Compressor
  11. Condenser
  12. Evaporator
  13. Heater radiator
  14. Expansion valve
  15. A/C control assembly
  16. Wire harness
No temperature control
  1. Air mix servomotor
  2. A/C control assembly
No air inlet control
  1. Air inlet servomotor
  2. A/C control assembly
  3. Wire harness
No mode control
  1. Air outlet servomotor
  2. A/C control assembly
  3. Wire harness
No engine idle-up when A/C switch ON
  1. A/C control assembly
  2. Wire harness
Set temperature value does not match up with operation of temperature control switch
  1. A/C control assembly
Brightness does not change when light control switch is turned
  1. Headlight and taillight system
  2. A/C control assembly
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