Chevrolet 2011 Express 1500 Cargo Owner's Manual page 286

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.
A. COLD Range
B. WARM Range
C. HOT Range
3. Check both sides of the dipstick,
and read the lower level.
The fluid level must be in the
COLD (A) range for a cold
check, transmission temperature
27°C to 32°C (80°F to 90°F),
between the COLD (A) and
HOT (C) range for a WARM (B)
check, 50°C to 60°C (122°F to
140°F) or in the HOT (C)
cross-hatched range for a hot
check, 71°C to 93°C (160°F to
200°F). Be sure to keep the
dipstick pointed down to get an
accurate reading.