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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 41 (MANUAL A/C-HEATER SYSTEMS)TROUBLESHOOTINGPROBLEM SYMPTOMS TABLE
2004 Toyota Celica GT, Standard

Problem Symptoms Table

2004 Toyota Celica GT, StandardSECTION Problem Symptoms Table
WARNING: This page is about a different car, the 2002 Toyota Celica. 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
No blower operation
  1. HTR Fuse
  2. Heater main relay
  3. Blower motor
  4. Blower resistor
  5. Blower speed control switch
  6. Wire harness
No blower control
  1. Blower motor
  2. Blower resistor
  3. Blower speed control switch
  4. Wire harness
No air temperature
  1. Engine coolant volume
  2. Heater control assembly
No compressor operation
  1. Refrigerant volume
  2. A.C Fuse
  3. Magnetic clutch
  4. Compressor lock sensor
  5. Compressor
  6. Pressure switch
  7. Heater main relay
  8. Blower speed control switch
  9. Heater control assembly
  10. Thermistor
  11. Wire harness
No cool air comes out
  1. Refrigerant volume
  2. Refrigerant pressure
  3. Drive belt
  4. Magnetic clutch
  5. Compressor lock sensor
  6. Pressure switch
  7. Thermistor
  8. Heater control assembly
  9. Wire harness
Insufficient cooling
  1. Refrigerant volume
  2. Drive belt
  3. Magnetic clutch
  4. Compressor
  5. Condenser
  6. Expansion Valve
  7. Evaporator
  8. Refrigerant lines
  9. Pressure switch
  10. A/C amplifier
  11. Heater control assembly
No engine idle-up when A/C switch ON
  1. Heater control assembly
  2. Engine (and ECT) ECU
  3. Idle control system
  4. Wire harness
No air inlet control
  1. Heater control assembly
  2. Wire harness
No mode control
  1. Heater control assembly
  2. Wire harness
Blinking of A/C indicator
  1. Compressor
  2. Drive belt
  3. Compressor lock sensor
  4. Heater control assembly
Brightness does not change when light control switch is turned
  1. Headlight and taillight system
  2. Heater control assembly
RENDER: 1.0x

NO RELATED

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.