GMC 2006 Sierra - Manual (Page 444)

4. If the fluid level is within the COLD CHECK band, the
transmission may be operated until the fluid is hot
enough to perform a hot check. If the fluid level is not
within the COLD CHECK band, add or drain fluid as
necessary to bring the level into the middle of the
COLD CHECK band.
5. Perform a hot check at the first opportunity after the
normal operating temperature of 160°F (71°C) to
200°F (93°C) is reached.
6. If the fluid level is in the acceptable range, push the
dipstick back in all the way.
Hot Check Procedure
The fluid must be hot to ensure an accurate check.
The fluid level rises as the temperature increases.
1. Operate the transmission in DRIVE (D) range until
the normal operating temperature of 160°F (71°C)
to 200°F (93°C) is reached.
2. Pull out the dipstick and wipe it with a clean rag or
paper towel.
3. Push it back in all the way, wait three seconds and
then pull it back out again. Repeat the check
procedure to verify the reading.
4. Safe operating level is within the HOT RUN band
on the dipstick. The width of the HOT RUN band
represents approximately 1.06 quart (1.0 liter)
of fluid at normal operating temperature.
5. If the fluid level is not within the HOT RUN band,
add or drain fluid as necessary to bring the fluid
level to within the HOT RUN band.
6. If the fluid level is in the acceptable range, push the
dipstick back in all the way.
Consistency of Readings
Always check the fluid level at least twice using
the procedures described previously. Consistency
(repeatable readings) is important to maintaining proper
fluid level. If inconsistent readings persist, check the
transmission breather to be sure it is clean and
unclogged. If readings are still inconsistent, contact
your dealer.
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