On-Vehicle Inspection

1. Measure the valve opening pressure.
   1. If there are water stains or foreign matter on O-ring 1, clean it with water and finger scouring.
   2. Check that O-ring 1 is not deformed, cracked or swollen.
   3. Apply engine coolant to O-ring 1 and rubber packing 2 before using a radiator cap tester.
      Fig 1: Identifying Radiator Cap O-Ring

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. When using the cap tester, tilt it more than 30°.
   5. Pump the cap tester several times, and check the maximum pressure*.

      Pump speed: 

      1 pump per second 

      *: Even if the cap cannot maintain the maximum pressure, it is not a defect.

      Fig 2: Checking Radiator Cap

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Judgment Criterion 

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

1. Check that the radiator and condenser are not blocked with leaves, dirt, or insects. Clean the hose connections.

   If the fins are blocked, wash them with water or a steam cleaner.

   NOTE:

   • If the distance between the steam cleaner and core is too close, the fins may be damaged.
   • Keep the following injection distance.

   Standard Injection Distance 

   INJECTION DISTANCE REFERENCE
   
   

   Injection Distance	Injection Pressure
   300 mm (11.8 in.)	2942 to 4903 kPa (30 to 50 kgf/cm2 , 427 to 711 psi)
   500 mm (19.7 in.)	4903 to 7845 kPa (50 to 80 kgf/cm2 , 711 to 1138 psi)

   NOTE:

   • If the fins are bent, straighten them with a screwdriver or pliers. 
   • Never apply water directly into the electric components. 
2. Dry the fins with compressed air.