Tools Required

J43421 Cooling System Pressure Test Adapter

1. Remove the pressure cap from the coolant surge tank.
2. Make sure that all the parts of the cap, tester, and adapter are clean.
3. Install Cooling System Pressure Test Adapter J43421 to the coolant surge tank.
   Fig 1: Installing Pressure Tester To Surge Tank

   Courtesy of GENERAL MOTORS CORP.
   CAUTION: WEAR SAFETY GOGGLES.
   CAUTION: NEVER PUMP THE SYSTEM ABOVE 152 KPA (22 PSI).
4. Pump the tester until the gauge needle reaches 138 kPa (20 psi).
5. Watch to see if needle falls. Inspect all hoses for excessive swelling. Check all joints for leaks.