2003 GMC Sonoma Owner's Manual - Page 284

3. Insert a new air filter. See Normal Maintenance Replacement Parts onpage 5-103 to determine which filter to use. 4. Reinstall the engine a.ir cleaner/filkr cover. Tighten the fastewrs : hold the cover i ~place. G i Refer to the Maintenance Schedule to determine when to replace the engine air cleaner/filter. See Part A: Scheduled Maintenance Services OR page 6-4 Notice: If the air cleanedfilter 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 cleanedfilterin place when you're driving. Automatic Transmission Fluid When to Check and Change A good time to check your automatic transmission fluid level is when the engine oil is changed. Operating the engine with the air cleaner/fillter off can cause you or others to be burned. The air cleaner not only cleans the air, it sto 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 cieanedfilter off. Change both the fluid and filter every 15,000 miles (25 000 km) if the vehicle is mainly driven under one or more of these conditions: @ In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions, change the fluid and filter every 50,000 miles (83 000 km). See Part A: Scheduled Maintenance Services on page 6-4 5-2 1