Radiator On-Vehicle Inspection

Measure the valve opening pressure.

1. If there are water stains or foreign matter on O-ring (*1), clean it with water and scour it with fingers.
   

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.
   





4. When using the cap tester, tilt it to 30°or more above the horizontal.
   

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.
   

   Judgment criterion:

   Item	Specified Condition
   Standard value (for brand-new cap)	93.3 to 122.7 kPa (0.95 to 1.25 kgf/cm2, 13.5 to 17.8 psi)
   Minimum standard value (after using cap)	78.5 kPa (0.8 kgf/cm2, 11.4 psi)

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