Hummer 2007 H3 Owner's Manual page 331

3. With your foot on the brake pedal, move the
shift lever through each gear range, pausing
for about three seconds in each range.
Then, position the shift lever in PARK (P).
4. Let the engine run at idle for three minutes
or more.
Then, without shutting off the engine, follow
these steps:
1. Flip the handle up and then pull out the
dipstick and wipe it with a clean rag or
paper towel.
See Engine Compartment Overview on
page 322 for more information on location.
2. Push it back in all the way, wait three seconds
and then pull it back out again.
The automatic
transmission dipstick
handle with this symbol
on it is located in the
engine compartment on
the passenger's side
of the vehicle.
3. 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.
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.
331