GMC 1999 Suburban, Owner'S Manual, Page: 300 / 424

yellow blue
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Get the vehicle warmed up by driving about 15 miles (24 km)
when outside temperatures are above 50
_F (10_C). If it’s
colder than 50
_F (10_C), drive the vehicle in THIRD (3)
until the engine temperature gage moves and then remains
steady for 10 minutes. Then follow the hot check procedures.
Checking Transmission Fluid Cold
A cold check is made after the vehicle has been sitting for
eight hours or more with the engine off and is used only as
a reference. Let the engine run at idle for five minutes if
outside temperatures are 50
_F (10_C) or more. If it’s
colder than 50
_F (10_C), you may have to idle the engine
longer. Should the fluid level be low during a cold check,
you must perform a hot check before adding fluid. This
will give you a more accurate reading of the fluid level.
Checking the Fluid Level
D Park your vehicle on a level place. Keep the
engine running.
D With the parking brake applied, place the shift lever
in PARK (P).
D With your foot on the brake pedal, move the shift lever
through each gear range, pausing for about three seconds
in each range. Then, position the shift lever in PARK (P).
D Let the engine run at idle for three minutes or more.
Then, without shutting off the engine, follow these steps:
1. The red transmission dipstick is located at the rear of
the engine compartment, on the passenger’s side.
Flip the handle up and then 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.