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On-Vehicle Inspection [10/2019 - ]: Procedure

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  1. INSPECT RADIATOR CAP SUB-ASSEMBLY 
    1. Measure the valve opening pressure.
      GTY964530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rubber packing (1)
      *b Rubber packing (2)
      *c Rubber packing (3)
      *d Valve seat
      1. If there are water stains or foreign matter on the rubber packings (1), (2) or (3), clean the part(s) with water and finger scouring.
      2. Check that the rubber packings (1), (2) and (3) are not deformed, cracked or swollen.
      3. Check that the rubber packing (3) and valve seat are not stuck together.
      4. Apply engine coolant to the rubber packings (2) and (3) before using the radiator cap tester.
      5. When using the radiator cap tester, tilt it upwards 30° or more.
        GTY964528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Radiator Cap Sub-assembly
        *a Radiator Cap Tester
        *b 30° or more
      6. Pump the radiator cap tester several times, and check the maximum pressure.

        Pump Speed

        1 pump per second

        HINT: 

        Even if the radiator cap sub-assembly cannot maintain the maximum pressure, it is not a defect.

        Result

        Item Specified Condition
        Standard pressure
        (for brand-new cap)        		 74 to 103 kPa (0.8 to 1.1 kgf/cm2 , 10.7 to 15 psi)
        Minimum pressure
        (for used cap)        		 59 kPa (0.6 kgf/cm2 , 8.6 psi)

        If the maximum pressure is less than the minimum pressure, replace the radiator cap sub-assembly.

  2. INSPECT FINS FOR BLOCKAGE 
    GTY569661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. If the fins are clogged, wash them with water or a steam cleaner and dry them with compressed air.
      NOTE:
      • To avoid damaging the fins, keep the tip of the nozzle at right angles to the core surface.
      • If the nozzle of the steam cleaner is too close to the core, there is a possibility of damaging the fins. Always maintain the following distances from the core when using a steam cleaner.
        STANDARD STEAM CLEANER NOZZLE DISTANCE

        Steam Pressure Specified Condition
        2942 to 4903 kPa (30.0 to 50.0 kgf/cm2 , 427 to 711 psi) 300 mm (11.8 in.)
        4903 to 7845 kPa (50.0 to 80.0 kgf/cm2 , 711 to 1138 psi) 500 mm (19.7 in.)
      • If the fins are bent, straighten them with a screwdriver or pliers.
      • Do not expose electronic components to water.
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