GM Service Manual Online
For 1990-2009 cars only
  1. Turn the engine off and put the transmission in PARK.

  2. Object Number: 258747  Size: SH
  3. Clean away any dirt around the plastic reservoir (1), the low pressure indicator switch (2), and the pump.
  4. Inspect the fluid level. The fluid level should be even with the fill marks on the side of the reservoir.
  5. If the fluid level is low, clean around and remove the reservoir cap.
  6. Add Dexron® III transmission fluid.
  7. Install the cap.