Pontiac Vibe 2003 Owner's Manual page 343

Short Trip/City Scheduled Maintenance
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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 60,000 miles (100 000 km) if the
vehicle is mainly driven under one or more of these conditions:
– In heavy city traffic where the outside temperature regularly
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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.
If you do not use your vehicle under any of these conditions, check the fluid.
See "Recommended Fluids and Lubricants" in the Index for the proper
fluid to use.
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Change transfer case fluid when doing frequent trailer towing.
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Change rear differential fluid when doing frequent trailer towing.
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