1999 GMC Suburban Owner's Manual - Page 298

yellowblue Refer to the Maintenance Schedule to determine when to replace the air filter. See "Owner Checks and Services" in the Index. 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. 4. Install the new filter by pushing it all the way to the stop on the duct. 5. Install the duct and the filter into the air cleaner housing. Make sure that the duct fits properly into the housing. 6. Install the cover and fasten the two retaining clips. 7. After the air filter is properly serviced, the indicator should be reset. Push the button on top of the indicator to reset it to the green (clean) filter zone. 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