RADIATOR > ON-VEHICLE INSPECTION

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1. Measure the valve opening pressure.
   

   Text in Illustration 

   *1	O-ring
   *2	Rubber Seal

   
   

   1. If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.
      

   2. Check that the O-ring is not deformed, cracked or swollen.
      

   3. Apply engine coolant to the O-ring and rubber seal before using the radiator cap tester.
      

   
   
   

   4. When using the cap tester, tilt it upwards 30 degrees or more.
      

      Text in Illustration 

      *1	Radiator Cap Tester
      *2	Radiator Cap

   5. Pump the cap tester several times, and check the maximum pressure*1.
      

      Pumping speed:

      1 pump per second
      

      HINT:

      *1: Even if the cap cannot maintain the maximum pressure, it is not defective.

      Judgment Criterion:

      Item	Specified Condition
      Standard value (brand-new cap)	94 to 122 kPa (1.0 to 1.2 kgf/cm2, 13.6 to 17 psi)
      Minimum standard value (used cap)	78 kPa (0.8 kgf/cm2, 11.3 psi)

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

1. If the fins are clogged, wash them with water or a steam cleaner and dry them with compressed air.
   

   NOTICE:

   1. To avoid damaging the fins, the injection direction should be at right angles to the radiator core surface.
      
   2. If the steam cleaner is too close to the radiator core, there is a possibility of damaging the fins, so keep the following injection distances.
      

      Standard Injection Distance:

      Injection Pressure	Specified Condition
      2942 to 4903 kPa (30 to 50 kgf/cm2, 427 to 711 psi)	300 mm (11.81 in.)
      4903 to 7845 kPa (50 to 80 kgf/cm2, 711 to 1138 psi)	500 mm (19.69 in.)

   3. If the fins are bent, straighten them with a screwdriver or pliers.
      
   4. Do not expose electronic components to water.