Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 42 (MANUAL A/C-HEATER SYSTEMS)TROUBLESHOOTINGPROBLEM SYMPTOMS
2004 Toyota Celica GT, Standard
Problem Symptoms
2004 Toyota Celica GT, StandardSECTION Problem Symptoms
WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
Use Problem Symptoms 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
| Symptom/Suspect Area | See | |||||
|---|---|---|---|---|---|---|
| No Blower Operation | ||||||
| HTR Fuse | Check Fuse | |||||
| Heater Main Relay | HEATER MAIN RELAY | |||||
| Blower Motor | BLOWER MOTOR | |||||
| Blower Resistor | BLOWER RESISTOR | |||||
| Blower Speed Control Switch | Step 1 under INSPECTION | |||||
| Wire Harness | Check Wire Harness | |||||
| No Air Temperature Control | ||||||
| Engine Coolant Volume | Check Engine Coolant | |||||
| Heater Control Assembly | HEATER CONTROL ASSEMBLY | |||||
| Water Valve | WATER VALVE | |||||
| No Compressor Operation | ||||||
| Refrigerant Volume | Step 1 under ON-VEHICLE INSPECTION | |||||
| AC Fuse | Check Fuse | |||||
| Magnetic Clutch | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Compressor | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Pressure Switch | PRESSURE SWITCH | |||||
| Heater Main Relay | HEATER MAIN RELAY | |||||
| Blower Speed Control Switch | Step 1 under INSPECTION | |||||
| A/C Switch | Step 3 Under INSPECTION | |||||
| Integration Control And Panel | Step 1 Under ON-VEHICLE INSPECTION | |||||
| Thermistor | Step 3 Under ON-VEHICLE INSPECTION | |||||
| Wire Harness | Check Wire Harness | |||||
| Compressor Operates Intermittently | ||||||
| Refrigerant Volume | Step 1 Under INSPECTION | |||||
| Pressure Switch | PRESSURE SWITCH | |||||
| A/C Switch | Step 3 Under INSPECTION | |||||
| Thermistor | Step 3 Under ON-VEHICLE INSPECTION | |||||
| Wire Harness | Check Wire Harness | |||||
| No Cool Air Comes Out | ||||||
| Refrigerant Volume | Step 1 Under INSPECTION | |||||
| Refrigerant Pressure | Step 2 Under INSPECTION | |||||
| Drive Belt | DRIVE BELT | |||||
| Magnetic Clutch | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Compressor | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Pressure Switch | PRESSURE SWITCH | |||||
| Thermistor | Step 3 Under ON-VEHICLE INSPECTION | |||||
| A/C Switch | Step 3 Under INSPECTION | |||||
| Integration Control And Panel | Step 1 Under ON-VEHICLE INSPECTION | |||||
| Heater Control Assembly | HEATER CONTROL ASSEMBLY | |||||
| Wire Harness | Check Wire Harness | |||||
| Cool Air Comes Out Only At High RPM | ||||||
| Refrigerant Volume | Step 1 Under ON-VEHICLE INSPECTION | |||||
| Drive Belt | DRIVE BELT | |||||
| Magnetic Clutch | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Compressor | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Condenser | CONDENSER | |||||
| Receiver | RECEIVER | |||||
| Expansion Valve | Step 2 Under ON-VEHICLE INSPECTION | |||||
| Evaporator | Step 1 Under INSPECTION | |||||
| Thermistor | Step 2 Under ON-VEHICLE INSPECTION | |||||
| A/C Switch | Step 3 Under INSPECTION | |||||
| Wire Harness | Check Wire Harness | |||||
| Insufficient Cooling | ||||||
| Refrigerant Volume | Step 1 Under ON-VEHICLE INSPECTION | |||||
| Drive Belt | DRIVE BELT | |||||
| Magnetic Clutch | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Compressor | COMPRESSOR AND MAGNETIC CLUTCH | |||||
| Condenser | CONDENSER | |||||
| Receiver | RECEIVER | |||||
| Expansion Valve | Step 2 Under ON-VEHICLE INSPECTION | |||||
| Evaporator | Step 1 Under INSPECTION | |||||
| Refrigerant Lines | REFRIGERANT LINE | |||||
| Pressure Switch | PRESSURE SWITCH | |||||
| Integration Control And Panel | Step 1 Under ON-VEHICLE INSPECTION | |||||
| Heater Control Assembly | HEATER CONTROL ASSEMBLY | |||||
| No Engine Idle-Up When A/C Switch ON | ||||||
| Integration Control And Panel | Step 1 Under ON-VEHICLE INSPECTION | |||||
| Idle Control System | (1)DTC P0505: IDLE CONTROL SYSTEM MALFUNCTION , (2)DTC P0505: IDLE CONTROL SYSTEM MALFUNCTION | |||||
| Wire Harness | Check Wire Harness | |||||
| Blinking Of A/C Indicator(2) | ||||||
| Compressor | Step 13 Under ON-VEHICLE INSPECTION | |||||
| Drive Belt | DRIVE BELT | |||||
| Compressor Lock Sensor | 13 Under ON-VEHICLE INSPECTION | |||||
| A/C Amplifier | Step 2 Under ON-VEHICLE INSPECTION | |||||
| No Warm Air Comes Out | ||||||
| Engine Coolant Volume | Check Engine Coolant | |||||
| Heater Control Assembly | HEATER CONTROL ASSEMBLY | |||||
| Water Valve | WATER VALVE | |||||
| Heater Radiator | Step 1 Under DISASSEMBLY | |||||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • 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.