Radiator Cap: Testing and Inspection

^ Tools Required:
- J 24460-01 or BT 7518 Cooling System Tester, Or Equivalent

WARNING: As long as there is pressure in the cooling system, the temperature can be considerably higher than the boiling temperature of the solution in radiator without causing the solution to boil. Removal of the radiator cap while engine is hot and pressure is high will cause the solution to boil instantaneously - possibly with explosive force - spewing the solution over engine, fenders and person removing cap. Under some conditions, the ethylene glycol in engine coolant is combustible.

1. Remove the radiator cap.
2. Wet the radiator cap gasket with water.
^ Wash off any sediment from the sealing surface.
3. Install the cap to cooling system tester.
4. Pump up the pressure to the pressure stamped on the cap by operating the plunger handle of cooling system tester.
5. Note the rate of decrease in pressure.
6. The pressure reading should remain within the corresponding pressure segment of the scale for about 10 seconds.
^ Replace the cap if it does NOT hold the pressure for 10 seconds.