1993 Pontiac Bonneville Owner's Manual - Page 286

ITEM NO. SERVICE 5 ITEM NO. SERVICE 7 Transaxle Service-Changeboththe fluid and filter every 15,000 miles (25 000 km) if the vehicle is mainly drivenunder one or more of these conditions: In heavy city traffic wherethe outside temperature regularly reaches 90°F (32OC) 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 of these .conditions, change both fluid and filter the every 100,000 miles (160 000 km). SparkPlug Replacement*-Replace spark plugs with the proper type. See the Index under Replacement Parts. 285 6 Engine Accessory Drive Belt Inspection*Inspect the belt for cracks, fraying, wear and proper tension. Replace as needed. 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 the Index under Coolant. This provides proper freeze protection, corrosion inhibitor level and engine operating temperature. Inspect hoses and replace they are cracked, if swollen or deteriorated. Tighten screw-type hose clamps. Clean the outsideof the radiator andair conditioning condenser. Wash the pressure cap and neck. To help ensure proper operation, we recommend a pressure testof both the cooling system and the pressure cap. 8