1994 Buick Roadmaster Owner's Manual - Page 293

5. Cooling System Service*-- Drain, flush and refill the system with new or approved recycled coolant conforming to GM Specification 1825M. Keep coolant at the proper mixtureas specified. See "Coolant" in the Index.This provides proper freeze and boil protection, corrosion inhibitor level and maintains properengine operating temperature. Inspect hoses and replace if they cracked, are swollen or deteriorated. Tighten screw-type hose clamps. Clean the outside of the radiator and air conditioning condenser.Wash the pressure cap and neck. 7. Transmission Service-- Change both the fluid and filter every 15,000 miles (25000 km) if the vehicle is mainly driven under or more of these one conditions: In heavy city traffic where the outside temperature regularly reaches90°F (32°C) or higher. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police car or delivery service. If you do not use your vehicle under any these of conditions, change both the fluid and filter every 100.000 miles (160 000 kml To help ensure proper operation,we recommend a pressure testof both the cooling system and the pressure cap. 6. Front Wheel Bearing Repack -- When your vehicle is used in such service as police work,as a taxi or indoor-to-door delivery, cleanand repack the each brake relining or15,000 front wheel bearings at miles (25 000 km), whichever comes first. If you don't use your vehicle in such service, clean and repack the bearings at each brake relining or30,000 miles (50000 km) whichever comes first.