2005 Chevrolet Astro Owner's Manual - Page 237

If the fluid level is low, add only enough of the proper fluid to bring the level up to the HOT area for a hot check. 1. Pull out the dipstick. 2. Using a funnel, add fluid down the transmission dipstick tube only after checking the transmission fluid while it is hot. A cold check is used only as a reference. It does not take much fluid, generally less than one pint (0.5 L). Do not overfill. Notice: Use of automatic transmission fluid labeled other than DEXRON®-III, Approved for the H-Specification, may damage your vehicle, and the damages may not be covered by your warranty. Always use automatic transmission fluid labeled DEXRON®-III, Approved for the H-Specification. 3. After adding fluid, recheck the fluid level as described under "How to Check," earlier in this section. 4. When the correct fluid level is obtained, push the dipstick back in all the way; then flip the handle down to lock the dipstick in place. 3. Check both sides of the dipstick, and read the lower level. The fluid level must be in the COLD area for a cold check or in the HOT or cross-hatched area for a hot check. Be sure to keep the dipstick pointed down to get an accurate reading. 4. If the fluid level is in the acceptable range, push the dipstick back in all the way; then flip the handle down to lock the dipstick in place. How to Add Fluid Refer to the Maintenance Schedule to determine what kind of transmission fluid to use. See Part D: Recommended Fluids and Lubricants on page 6-29. 5-25