Automatic Transmission Fluid (6-Speed Transmission) - GMC Sierra 2008 Owner's Manual

3. Remove the engine air cleaner/filter from the
housing. Care should be taken to dislodge as
little dirt as possible.
4. Clean the engine air cleaner/filter sealing surfaces
and the housing.
5. Inspect or replace the engine air cleaner/filter.
6. Reinstall the cover and tighten the screws.
7. Reset the air filter restriction indicator, if the vehicle
has one, by pressing the top button on the indicator.
5-24
CAUTION:
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Operating the engine with the air cleaner/filter
off can cause you or others to be burned.
The air cleaner not only cleans the air; it
helps to stop flames if the engine backfires.
If it is not there and the engine backfires,
you could be burned. Do not drive with it off,
and be careful working on the engine with
the air cleaner/filter off.
Automatic Transmission Fluid
(6-Speed Transmission)
When to Check and Change Automatic
Transmission Fluid
It is usually not necessary to check the transmission
fluid level. The only reason for fluid loss is a
transmission leak or overheating the transmission.
If you suspect a small leak, then use the following
checking procedures to check the fluid level.