GMC Sierra Denali 2009 Owner's Manual page 364

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.
5-24
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.
Hot Check Procedure
Use this procedure to check the transmission fluid level
when the transmission fluid temperature is between
160°F and 200°F (71°C and 93°C).
The hot check is the most accurate method to check the
fluid level. The hot check should be performed at the
first opportunity in order to verify the cold check.
The fluid level rises as fluid temperature increases, so it
is important to ensure the transmission temperature
is within range.
See Engine Compartment Overview on page 5-14
for more information.
1. Locate the transmission
dipstick at the
rear of the engine
compartment, on the
passenger side of
the vehicle.