1998 Chevrolet Express Van Owner's Manual - Page 337

I Short TripKity Maintenance Schedule Gasoline Engines -- 1 100,000 Miles (166 000 km) (Continued) - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. 0 If you haven't usedyour vehicle under severe service conditions listed previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. 0 Inspect Positive Crankcase Ventilation (PCV) valve. An Emission Control 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" in the Index for what to use. Inspect hoses. Clean radiator, condenser, pressure and neck. Pressure test cap cooling system and pressurecap. An Emission Control Service. MILEAGE 7-26