Radiator On-Vehicle Inspection

Measure the valve opening pressure.

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

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

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

4. Apply engine coolant to rubber seals 2 and 3 before using a radiator cap tester.
   





5. When using the cap tester, tilt it upwards 30° or more.
   

6. 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 Criteria:

   Item	Specified Condition
   Standard value (for brand-new cap)	74 to 103 kPa (0.8 to 1.1 kgf/cm2, 10.7 to 15 psi)
   Minimum standard value (for used cap)	59 kPa (0.6 kgf/cm2, 8.6 psi)

   If the maximum pressure is less than the minimum standard value, replace the radiator 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 radiator core surface.
   
2. Use it foe core perpendicularly.
   
3. 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.)

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