Chevrolet 2001 Express Van Owner's Manual page 289

Checking the Fluid Level
Prepare your vehicle as follows:
D
Park your vehicle on a level place. Keep the
engine running.
D
With the parking brake applied, place the shift
lever in PARK (P).
D
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).
D
Let the engine run at idle for three minutes or more.
6-20
Then, without shutting off the engine, follow these steps:
1. The transmission dipstick has a red handle and is
located near the center of the engine compartment.
See "Engine Compartment Overview" in the Index
for more information on location. 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.