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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 373 (COOLING SYSTEM)COOLING SYSTEMON-VEHICLE INSPECTION
2004 Toyota Celica GT, Standard

On-Vehicle Inspection

2004 Toyota Celica GT, StandardSECTION On-Vehicle Inspection
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT COOLING SYSTEM FOR LEAKS 
    1. Remove the water outlet cap.
      CAUTION: To avoid the danger of being burned, do not remove the water outlet cap while the engine and radiator are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator.
    2. Fill the radiator with coolant, then attach a radiator cap tester.
      Fig 1: Attaching Radiator Cap Tester
      G00915102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Warm up the engine.
    4. Pump it to 118 kPa (1.2 kgf/cm2 , 17.1 psi), then check that the pressure does not drop.

      If the pressure drops, check the hoses, radiator and water pump for leaks. If there are no signs or traces of external coolant leaks, check the heater core, cylinder block and head.

    5. Reinstall the water outlet cap.
  2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR 
    1. The engine coolant should be between the "LOW" and "FULL" lines when the engine is cold. If low, check for leaks and add "Toyota Super Long Life Coolant" or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology up to the "FULL" line.
  3. CHECK ENGINE COOLANT QUALITY 
    1. Remove the water outlet cap.
      CAUTION: To avoid the danger of being burned, do not remove the water outlet cap while the engine and radiator are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator.
    2. Check if there are any excessive deposits of rust or scale around the water outlet cap and water outlet filler hole; the coolant should free of oil.

      If excessively dirty, replace the coolant.

    3. Reinstall the water outlet cap.
  4. INSPECT FIN BLOCKAGE 
    1. If the fins are clogged, wash them with water or a steam cleaner, then dry with compressed air.
      Fig 2: Drying Fins With Compressed Air
      G00915103Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.