Grand Prix V6-3.8L SC VIN 1 (1997)
Radiator Cap: Testing and Inspection
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.
