Chevrolet 1999 Prizm Owner's Manual page 309

Long Trip/Highway Scheduled Maintenance
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Inspect fuel tank, cap, cap gasket and lines for damage or leaks (or every
24 months, whichever occurs first). Replace parts as needed.
An Emission Control Service. (See footnote
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Drain, flush and refill cooling system (or every 24 months, whichever occurs
first). See "Engine Coolant" in the Index for what to use. Inspect hoses. Clean
radiator, condenser, pressure cap and neck. Pressure test cooling system and
pressure cap.
An Emission Control Service. (See footnote
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Change manual transaxle fluid every 30,000 miles (50 000 km) only if your
vehicle is used to tow a trailer.
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Change automatic transaxle fluid 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
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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.
If you do not use your vehicle under any of these conditions, check the fluid.
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