GMC 2008 Yukon Denali Owner's Manual page 359

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.
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.
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