GMC 1998 Savana Van Owner's Manual page 257

5 . Install a new filter element with the folds in the
down position.
Reverse Steps 1 through 4 to replace the air cleaner.
See "Normal Replacement Parts" for the proper filter
to use.
Refer to the Maintenance Schedule to determine when to
replace the air filter and crankcase ventilation filter.
See "Scheduled Maintenance Services" in the Index.
I
Operating the engine with the air cleaner off can
cause you or others to be burned. The air cleaner
not only cleans the air, it stops flame if the engine
backfires. If it isn't there, and the engine
backfires, you could be burned. Don't drive with
it off, and be careful working on the engine with
the air cleaner off.
NOTICE:
If the
air
cleaner is off, a backfire can cause a
damaging engine fire. And, dirt can easily get
into your engine, which will damage
it.
Always
have the air cleaner in place when you're driving.
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's GVWR is over 8,600 or
if the vehicle is mainly driven under one or more of
these conditions:
0
In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
0
In hilly or mountainous terrain.
0
When doing frequent trailer towing.
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