GM Service Manual Online
For 1990-2009 cars only
  1. Start the engine.
  2. Charge the system air pressure to the governor cut-out point.

  3. Object Number: 202596  Size: MH
  4. Apply a soap solution to cover the valve.
  5. Verify that no leakage occurs. If bubbles appear, install the valve core finger tightly.
  6. Check for leaks. If air leakage is still present, replace the valve.