GM Service Manual Online
For 1990-2009 cars only
  1. Start the vehicle.
  2. Set the temperature to 32°C (90°F).
  3. Allow a minimum of 45 seconds for the air mix valve actuator (3) to move the output crank to the full hot position.
  4. Move the temperature valve to the full hot position.

  5. Object Number: 305037  Size: SH
  6. Pull the valve link from the retainer on the temperature valve.
  7. Snap the valve link into the retainer on the temperature valve.