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 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.
   





4. When using the cap tester, tilt it more than 30°.
   

   Text in Illustration

   *1	Radiator Cap
   *2	Radiator Cap Tester
   *a	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.
   

   Judgment Criterion:

   Item	Specified Condition
   Standard value (for brand-new cap)	93 to 123 kPa (1.0 to 1.3 kgf/cm2, 13.5 to 18 psi)
   Minimum standard value (after using cap)	79 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.
   

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 core surface.
   
2. If the steam cleaner is too close to the core, there is a possibility of damaging the fins, so maintain the following injection distances.
   

   Standard Injection Distance:

   Injection 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.)

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

Dry the fins with compressed air.