GMC Sierra Classic 2007 Owner's Manual page 491

3. With your foot on the brake pedal, run the
engine for at least once minute and shift to
DRIVE (D). Then shift to NEUTRAL (N) and
then REVERSE (R) to fill the hydraulic system.
Then, position the shift lever in PARK (P).
4. Allow the engine to run at idle (500–800 rpm).
Slowly release the brake pedal.
Then, without shutting off the engine, follow
these steps:
Cold Check Procedure
The purpose of the cold check is to determine if
the transmission has enough fluid to be operated
safely until a hot check can be made. The
fluid level rises as fluid temperature increases. Do
not fill above the COLD CHECK band if the
transmission fluid is below normal operating
temperatures.
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.
3. Check the fluid level reading. Repeat the
check procedure to verify the reading.
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.
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