GM Service Manual Online
For 1990-2009 cars only

Cooling System Leak Testing Surge cap Pressure Test

On-Vehicle Pressure Testing Procedure

Tools Required

    • J 24460-01 Cooling System and Cap Pressure Tester
    • J 24460-92 Cooling System Tester Adapter
  1. Inspect the connections of the coolant hoses for leaks. Repair as required.
  2. Remove the surge tank cap.

  3. Object Number: 27650  Size: SH
  4. Install J 24460-01 to the surge tank. Follow the instructions supplied with the J 24460-01 .
  5. Build up pressure to no more than 138 kPa (20 psi).
  6. The system should hold the pressure for about two minutes.
  7. • If a measurable amount of pressure drops within two minutes, check for a leak.
    • If there is a leak, remove the radiator. Replace the radiator. Refer to Radiator Replacement .