Radiator On-Vehicle Inspection

Measure the valve opening pressure.

1. If there are water stains or foreign matter on rubber packings 1, 2 or 3, clean the part(s) with water and finger scouring.
   

2. Check that rubber packings 1, 2 and 3 are not deformed, cracked or swollen.
   

3. Check that rubber packings 3 and 4 are not stuck together.
   

4. Apply engine coolant to rubber packings 2 and 3 before using the radiator cap tester.
   

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





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

   Pumping speed:

   1 pumps every second
   

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

   Judgment Criteria:

   Item	Specified Condition
   Standard valve (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 valve (after using cap)	78.5 kPa (0.8 kgf/cm2, 11.4 psi)

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