Pontiac 2005 Aztek Owner's Manual page 304

Then, without shutting off the engine, do the following:
The dipstick handle is a bright red loop. See Engine
Compartment Overview on page 5-12 for more
information on location.
1. 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.
5-22
The dipstick is located
toward the back of the
engine compartment,
next to the brake master
cylinder.
3. Check both sides of the dipstick, and read the
lower level. The fluid level must be in the
cross-hatched area.
4. If the fluid level is in the acceptable range, push the
dipstick back in all the way.
How to Add Automatic Transaxle Fluid
Refer to the Maintenance Schedule to determine
what kind of transaxle fluid to use. See Recommended
Fluids and Lubricants on page 6-12.
If the fluid level is low, add only enough of the proper
fluid to bring the level into the cross-hatched area on
the dipstick.
1. Pull out the dipstick.
2. Using a long-neck funnel, add enough fluid at the
dipstick hole to bring it to the proper level.
It does not take much fluid, generally less than
one pint (0.5 L). Do not overfill.