2003 Chevrolet Avalanche Owner's Manual - Page 448

97,500 Miles (162 500 km) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. 0 Rotate tires. See Tire Inspection and Rotation on page 5-59 for proper rotation pattern and additional information. (See footnote +.) 0 If you haven't used your vehicle under severe service conditions listed previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. 0 Change transfer case fluid. 0 Except 8.1 L V8 Engine: Inspect Positive Crankcase Ventilation (PCV) valve. An Emission Control Service. 100,000 Miles (166 000 km) 0 Inspect spark plug wires. An Emission Control Service. 0 Replace spark plugs. An Emission Control Service. 0 Change automatic transmission fluid and filter if the vehicle's GVWR is over 8600 Ibs or 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. 150,000 Miles (240 000 km) 0 Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See Engine Coolant on page 5-24 for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Service. Inspect engine accessory drive belt. An Emission Control Service. 6-9