Hummer 2008 H2 Owner's Manual page 358

6. Using the TRANS TEMP reading, determine and
perform the appropriate check procedure. If the
TRANS TEMP reading is not within the required
temperature ranges, allow the vehicle to cool,
or operate the vehicle until the appropriate
transmission fluid temperature is reached.
Cold Check Procedure
Use this procedure only as a reference to determine
if the transmission has enough fluid to be operated
safely until a hot check procedure can be made.
The hot check procedure is the most accurate method
to check the fluid level. Perform the hot check procedure
at the first opportunity. Use this cold check procedure
to check fluid level when the transmission temperature
is between 80°F and 90°F (27°C and 32°C).
1. Locate the transmission dipstick at the rear of the
engine compartment, on the passenger side of the
vehicle.
2. Flip the handle up, and then pull out the dipstick
and wipe it with a clean rag or paper towel.
5-22
The dipstick handle has
this graphic. See Engine
Compartment Overview
on page 5-12 for more
information.
3. Install the dipstick by pushing it back in all the way,
wait three seconds, and then pull it back out again.
4. Check both sides of the dipstick, and read the lower
level. Repeat the check procedure to verify the
reading.
5. If the fluid level is below the COLD check band,
add only enough fluid as necessary to bring the
level into the COLD band. It does not take
much fluid, generally less than one pint (0.5L).
Do not overfill.
6. Perform a hot check at the first opportunity after
the transmission reaches a normal operating
temperature between 160°F to 200°F (71°C to 93°C).
7. 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.