GMC 2012 Savana Owner's Manual page 266

Should the fluid level be low during
this cold check, the fluid must be
checked Warm or Hot before adding
fluid. If the outside temperature is
colder than 15°C (60°F) or hotter
than 32°C (90°F), a cold check
cannot be performed.
A warm fluid level check can be
performed by driving the vehicle
under lightly loaded conditions and
outside temperatures between 10°C
to 27°C (50°F to 80°F). The vehicle
should be driven for at least 24 km
(15 mi) before performing a warm
check. Checking the fluid Warm or
Hot will give a more accurate
reading of the fluid level than a cold
check.
Because the vehicle is equipped
with a high-efficiency air-to-oil
cooler, the transmission fluid
temperature may not reach the
required Hot fluid level checking
temperature under normal lightly
loaded driving vehicle conditions.
Prepare the vehicle as follows:
1. Park the vehicle on a level
place. Keep the engine running.
2. With the parking brake applied,
place the shift lever in P (Park).
3. With foot on the brake pedal,
move the shift lever through
each gear range, pausing for
about three seconds in each
range. When M is reached,
move the selector from M1
through M3. Then, position the
shift lever in P (Park).
4. Let the engine run at idle for
two minutes or more.
Then, without shutting off the
engine:
The transmission dipstick is located
near the center of the engine
compartment and will be labeled
with the graphic shown.
See
for more information
on location.
1. Flip the handle up and then pull
out the dipstick and wipe it with
a clean rag or paper towel.
2. Push it back in all the way, wait
three seconds and then pull it
back out again.