1997 Buick Riviera Owner's Manual - Page 260

NOTICE: If you use an impropercoolant mix, your engine could overheat and badly damaged. The be repair cost wouldn't be covered by your warranty. Too much water in the can freeze mix and crack theengine, radiator, heater core and other parts. If you have to add coolant more than four times a year, have your dealer check your cooling system. Checking Coolant I NOTICE: If you use the propercoolant, you don't have to add extra inhibitors or additives which claim to improve thesystem. These can be harmful. The engine coolant recovery tank located on the is driver's sideof the engine compartment. When your engineis cold, the coolant level should at be FULL COLD or a little higher. When your engine is warm, the level should be up FULL HOT or a to little higher. 6-23