Hummer 2009 H2 - Manual (Page 377)

{ CAUTION:
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.
Notice: If the air cleaner/filter is off, a backfire can
cause a damaging engine fire. And, dirt can easily get
into the engine, which will damage it. Always have
the air cleaner/filter in place when you are driving.
Automatic Transmission Fluid
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. However, if there is a large leak, then it
may be necessary to have the vehicle towed to a dealer/
retailer service department and have it repaired before
driving the vehicle further.
Notice: Use of the incorrect automatic transmission
fluid may damage the vehicle, and the damages may
not be covered by the vehicle’s warranty. Always
use the automatic transmission fluid listed in
Recommended Fluids and Lubricants on page 6-13.
Change the fluid and filter at the intervals listed in the
Maintenance Schedule. See Scheduled Maintenance on
page 6-4. Be sure to use the transmission fluid listed
in Recommended Fluids and Lubricants on page 6-13.
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