1997 Chevrolet Suburban Owner's Manual - Page 299

Refer to the Maintenance Schedule to determine when to replace the air filter. See "Owner Checksand Services" in the Index. Automatic Transmission Fluid When to Check and Change A good time to checkyour automatic transmission fluid level iswhen the engine oil is changed. Change both the fluid and filter every 50,000 miles (83 000 km) if the vehicle is mainly driven under one or more of these conditions: 0 A CAUTION: Operating theengine withthe air cleaner off can cause you or others tobe burned. Theair cleaner not only cleansthe air, it stopsflame if the engine engine backfhes. If it isn't there, and the backfires, you could beburned. Don't drive with it off, and be careful working on the engine with the air cleaner off. 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. 0 Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions, the fluid and filter do not require changing. NOTICE: If the air cleaner is off, a backfire can cause a damaging engine fire. And, dirt can easily get into yourengine, whichwill damage it. Always have the air cleaner in place when you're driving. See "Scheduled Maintenance Services" in the Index. How to Check Because this operation can be a little difficult, you may choose tohave this done at your GM dealership Service Department.