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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 666 (HEATER & AIR CONDITIONER)PROBLEM SYMPTOMS TABLE
2004 Toyota Matrix XR, FWD, Standard

Problem Symptoms Table

2004 Toyota Matrix XR, FWD, StandardSECTION Problem Symptoms Table
WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

Use the table below to help you to find the cause of the problems. 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 the A/C system does not operate.
  1. HTR fuse (50 A)
  2. HTR fuse (10 A)
  3. A/C control assy
  4. Wire harness or connector
Air Flow Control: No blower operation
  1. Heater blower motor relay
  2. Blower w/fan motor sub-assy
  3. A/C control assy
  4. Wire harness or connector
Air Flow Control: No blower control
  1. Blower w/fan motor sub-assy
  2. Blower resistor
  3. A/C control assy
  4. Wire harness or connector
Air Flow Control: Insufficient air flow
  1. Blower w/fan motor sub-assy
  2. A/C control assy
  3. Wire harness or connector
Temperature Control: No cool air comes out
  1. Volume of refrigerant
  2. Drive belt tension
  3. Refrigerant pressure
  4. Cooler compressor assy
  5. Pressure switch No. 1
  6. Air mix damper servo sub-assy
  7. Condenser fan
  8. A/C control assy
  9. Wire harness or connector
Temperature Control: No warm air comes out
  1. Engine coolant volume
  2. Air mix damper servo sub-assy
  3. Cooler thermistor No. 1
  4. A/C control assy
  5. Heater radiator unit sub-assy
  6. Wire harness or connector
Temperature Control: Out coming air is warmer or cooler than the set temperature or response is slow.
  1. Air mix damper servo sub-assy
  2. A/C control assy
  3. Wire harness or connector
Temperature Control: No temperature control (only Max. cool or Max. warm)
  1. Air mix damper servo sub-assy
  2. A/C control assy
  3. Wire harness or connector
No air inlet control
  1. Blower damper servo sub-assy
  2. A/C control assy
  3. Wire harness or connector
No air outlet control
  1. Mode damper servo sub-assy
  2. A/C control assy
  3. Wire harness or connector
No engine idle-up when A/C switch ON
  1. Cooler compressor assy
  2. A/C control assy
  3. ECM
  4. Wire harness or connector
Brightness does not changes when rheostat volume or light control switch it turned.
  1. Illumination light system
  2. A/C control assy
  3. Wire harness or connector
RENDER: 1.0x

NO RELATED

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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.