Chevrolet Colorado 2012 Owner's Manual page 251

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A good time to check the automatic
transmission fluid level is when the
engine oil is changed.
Change the fluid and filter at the
intervals listed in
, and be
sure to use the transmission fluid
listed in
Because this operation can be a
little difficult, it may be decided to
have this done at the dealer service
department.
If not taken to the dealer, be sure to
follow all the instructions here, or a
false reading on the dipstick could
result.
Wait at least 30 minutes before
checking the transmission fluid level
if the vehicle has been driven:
.
When outside temperatures are
above 32°C (90°F).
At high speed for quite a while.
In heavy traffic
hot weather.
While pulling a trailer.
To get the right reading, the fluid
should be at normal operating
temperature, which is 82°C to 93°C
(180°F to 200°F).
Get the vehicle warmed up by
driving about 24 km (15 mi) when
outside temperatures are above
10°C (50°F). If it is colder than 10°C
(50°F), drive the vehicle in 3 (Third)
until the engine temperature gauge
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 10°C (50°F) or
more. If it is colder than 10°C
(50°F), the engine may have to
idle longer. Should the fluid level be
low during this cold check, check
especially in
the fluid hot before adding fluid.
Checking the fluid hot gives a more
accurate reading of the fluid level.

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