Hummer 2007 H3 - Manual (Page 330)

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. Too little fluid could
cause the transmission to overheat. 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:
• When outside temperatures are above
90°F (32°C).
• At high speed for quite a while.
• In heavy traffic — especially in hot weather.
• While pulling a trailer.
To get the right reading, the fluid should
be at normal operating temperature, which is
180°F to 200°F (82°C to 93°C).
Get the vehicle warmed up by driving about
15 miles (24 km) when outside temperatures are
above 50°F (10°C). If it is 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.
A cold fluid check can be made after the vehicle has
been sitting for eight hours or more with the engine
off, but this 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 is colder
than 50°F (10°C), you may have to idle the engine
longer. Should the fluid level be low during this cold
check, you must check the fluid hot before adding
fluid. Checking the fluid hot will give you a more
accurate reading of the fluid level.
Checking the Fluid Level
Prepare your vehicle as follows:
1. Park your vehicle on a level place. Keep the
engine running.
2. With the parking brake applied, place the shift
lever in PARK (P).
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