GMC 2003 Sierra - Manual (Page 399)

To leplace the errgjne arr deaner/liHer cfo ihe iol lowing:
1, Loosen (he screws on the cover of ihe housing
artd lift up the cover.
2.. Pemovfl the air deaner.^ltar frcmi the housing. Cane
should be latierr to disfodge as littfe dirt as possible
3. Clean the filter sealing surface and the housing.
4^ install the new angine air cleanor/filter,
5. Painstgll the cover and ttghien the scnew&.
Hater to lha Mqintonanco Schadulo lo determine when
la replace Ihe engine air cleaner/tiller See
Pari Bi
Owner Checks ancf Services cvi page G-1 h
5'24 --------------------------------------------------------
A
CAUTION:
Operating the engine with the air deaner/Illter
oft
Can Cause you or others to be burned. The
air cleaner not only cleans the air, il stops
flame if the engine backfires, if it isn’t there
and the engine backhreSr you could be burned.
Don't drive with it off, and be careful working
on the engine with the air cleaner/flller off.
Natice: If the air cleaner/fiiter is ofl^ a backfire can
cause a damaging engine fire. And. dirt can
easily get into your engine, which wifi damage II.
Always have the air cleaner/fliter in pface when
youVe driving.