2003 Hummer H2 Owner's Manual - Page 352

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 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/filter off. 2. Pull the air cleaner/filter up and out from the housing. Care should be taken to dislodge as little dirt as possible. 3. Clean the filter sealing surface and the housing. 4. Install the new engine air cleaner/filter. 5. Reinstall the cover and tighten the screws. Refer to the Maintenance Schedule to determine when to replace the engine air cleaner/filter. See "Owner Checks and Services" in the Index. NOTICE: If the air cleaner/filter 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/filter in place when you're driving. 6-18