GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 24460-01 Cooling System Tester

Caution: This vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Failure to follow the correct procedure could cause the following conditions:

   • Air bag deployment
   • Personal injury
   • Unnecessary SIR system repairs
In order to avoid the above conditions, observe the following guidelines:
   • Refer to SIR Component Views in order to determine if you are performing service on or near the SIR components or the SIR wiring.
   • If you are performing service on or near the SIR components or the SIR wiring, disable the SIR system. Refer to Disabling the SIR System.

The vehicle is equipped with an aluminum radiator. Use the outlined instructions in the Aluminum Radiator Diagnosis section in order to remove the cap:

  1. Remove the cap.
  2. Wet the radiator cap gasket with water.
  3. Wash off any sediment from the sealing surface.
  4. Install the cap to J 24460-01 .
  5. Use the plunger handle of J 24460-01 in order to increase the pressure as specified on the cap.
  6. Note the rate of decrease in the pressure.
  7. The specified reading of the pressure should remain within the corresponding pressure scale for more than 10 seconds.
  8. Replace the radiator cap if it does not maintain the pressure for more than 10 seconds.