2009 GMC Envoy Owner's Manual - Page 326

Consistency of Readings Always check the fluid level at least twice using the procedure described previously. Consistency (repeatable readings) is important to maintaining proper fluid level. If inconsistent readings persist, contact your dealer/retailer. Cooling System The cooling system allows the engine to maintain the correct working temperature. How to Add Automatic Transmission Fluid Refer to the Maintenance Schedule to determine what kind of transmission fluid to use. See Recommended Fluids and Lubricants on page 6-12. Add fluid only after checking the transmission fluid while it is hot. A cold check is used only as a reference. 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. It does not take much fluid, generally less than one pint (0.5 L). Do not overfill. Notice: Use of the incorrect automatic transmission fluid may damage the vehicle, and the damages may not be covered by the vehicle's warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants on page 6-12. • After adding fluid, recheck the fluid level as described under "How to Check Automatic Transmission Fluid" earlier in this section. • 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. 5-24 5.3L V8 Engine shown, 4.2L L6 Engine similar A. Coolant Recovery Tank B. Radiator Pressure Cap C. Engine Fan