GMC YUKON DENALI 1999 Owner's Manual page 280

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If you do it yourself, be sure to follow all the instructions
here, or you could get a false reading on the dipstick.
NOTICE:
Too much or too little fluid can damage your
transmission. Too much can mean that some of
the fluid could come out and fall on hot engine
parts or exhaust system parts, starting a fire. Be
sure to get an accurate reading if you check your
transmission fluid.
Wait at least 30 minutes before checking the
transmission fluid level if you have been driving:
D
When outside temperatures are above 90
D
At high speed for quite a while.
D
--
In heavy traffic
especially in hot weather.
D
While pulling a trailer.
To get the right reading, the fluid should be at normal
operating temperature, which is 180
_
_
(82
C to 93
C).
6-18
Get the vehicle warmed up by driving about 15 miles (24 km)
when outside temperatures are above 50
colder than 50
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
colder than 50
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
_
_
F (32
C).
D
D
D
_
_
F to 200
F
D
_
_
F (10
C), drive the vehicle in THIRD (3)
_
F (10
_
_
F (10
C), you may have to idle the engine
Park your vehicle on a level place. Keep the
engine running.
With the parking brake applied, place the shift lever
in PARK (P).
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).
Let the engine run at idle for three minutes or more.
yellowblue
_
_
F (10
C). If it's
_
C) or more. If it's

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1999 yukon denali

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