Chevrolet TrailBlazer 2007 Owner's Manual page 410

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.
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 527.
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.
410
Notice: Use of the incorrect automatic
transmission fluid may damage your vehicle,
and the damages may not be covered
by your warranty. Always use the automatic
transmission fluid listed in Recommended
Fluids and Lubricants on page 527.
•
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.