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Automatic transmission fluid, Notice – Global Machinery Company Sierra 1999 User Manual

Page 317

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3. Remove the air filter by pulling downward on the

element. Remove the second portion of the air filter
by sliding it towards the rear of the vehicle and then
pulling downward.

4. Install the new filter by reversing the steps listed

previously. Be sure to follow any instructions that
may be included in the replacement filter package.

Refer to the Maintenance Schedule to determine when to
replace the passenger compartment air filter. See
“Scheduled Maintenance” in the Index.

Automatic Transmission Fluid

If your vehicle has a diesel engine, see “Automatic
Transmission Fluid” in the Diesel Supplement.

When to Check and Change

A good time to check your automatic transmission fluid
level is when the engine oil is changed.

Change both the fluid and filter every 50,000 miles
(83 000 km) if the vehicle is mainly driven under one or
more of these conditions:
D In heavy city traffic where the outside temperature

regularly reaches 90

_F (32_C) or higher.

D In hilly or mountainous terrain.

D When doing frequent trailer towing.
D Uses such as found in taxi, police or delivery service.
If you do not use your vehicle under any of these
conditions, change the fluid and filter every
100,000 miles (166 000 km).

See “Scheduled Maintenance Services” in the Index.

How to Check

Because this operation can be a little difficult, you may
choose to have this done at the dealership service
department.

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.