1994 Chevrolet Astro Owner's Manual - Page 302

6. TRANSMISSION SERVICE: - Change the transmission 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. Frequent trailer pulling. 0 Uses such as taxi, police, delivery or other commercial service. If the vehicleis not used mainly under any of these conditions, change the fluid and filter every 30,000 miles (50 000 km). See "Automatic Transmission Fluid" in the Index for more information. 7. FUEL FILTER REPLACEMENT*$ Replace the fuel filter at the specified interval or sooner if clogged. 8. SPARK PLUG REPLACEMENT*- Replace spark plugs with the type listed in Section 6. See "Specification Charts" in the Index. 9. SPARK PLUG WIRE INSPECTION*- Clean wires and inspect for bums, cracks or other damage. Checkwire boot fit at the the distributor and at the spark plugs. Replace wires as needed. 10. ENGINE TIMING CHECK AND DISTRIBUTOR CHECK*$Adjust timing to underhood label specifications. Inspect the inside and outside of the distributor cap and rotor for cracks, carbon tracking and corrosion. Clean or replace needed. as 11. FUEL TANK, CAP AND LINES INSPECTION*$ Inspect the fuel tank, cap and lines for damage leaks. Remove fuel cap, inspect or gasket for an even filler imprint, and any damage. Replaceparts neck as needed. 12. ENGINE ACCESSORY DRIVE BELT INSPECTION*- Inspect belt. Look for cracks, fraying, wear, and proper tension. Adjust or replace as needed. * An Emission Control Service $ The CaliforniaAir Resources Board has determined that the failure to perform this maintenance item will not nullify the emission warrantylimit recall liability prior to the or completion of vehicle useful life. General Motors, however, urges that all recommended maintenance services be performed at the indicated intervals and the maintenance be recorded. 7-8