1999 Chevrolet Tahoe Owner's Manual - Page 387

yellowblue Long Trip/Highway Scheduled Maintenance -- Gasoline Engines 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. j 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. j Inspect Positive Crankcase Ventilation (PCV) valve. An Emission Control Service. j Change automatic transmission fluid and filter if the vehicle is mainly driven 150,000 Miles (240 000 km) j Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See "Engine Coolant" in the Index 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. DATE ACTUAL MILEAGE SERVICED BY: 7-37