Chevrolet 2009 Suburban Owner's Manual page 427

Then, without shutting off the engine, follow these steps:
See Engine Compartment Overview on page 5-14
for more information on location.
2. Flip the handle up and then pull out the dipstick
and wipe it with a clean rag or paper towel.
3. Push it back in all the way, wait three seconds and
then pull it back out again.
1. Locate the transmission
dipstick handle with this
graphic which is located
at the rear of the engine
compartment, on the
passenger side of the
vehicle.
4. Check both sides of the dipstick, and read the lower
level. The fluid level must be in the COLD area,
below the cross-hatched 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.
5. 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.
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
readings are still inconsistent, contact your dealer/retailer.
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