1998 Buick Riviera Owner's Manual - Page 221

The coolant levelshould be at or above FULL COLD. If it isn't, you may have a leakthe radiator hoses, in heater hoses, radiator, water pump or somewhere in else the cooling system. NOTICE: Engine damage from running your engine without coolantisn't covered by your warranty. If there seems to be no leak, with the engine on, check to If the see if the electric engine cooling fans are running. engine is overheating, both fans should be running. If they aren't, your vehicle needs service. Heater and radiator hoses, and otherengine parts, canbe very hot. Don't touch them.If you do, you can be burned. f Don't run the engineif there is a leak. I you run the engine, it could lose all coolant. That could cause anengine fire, andyou could be burned. Get any leak fixed before you drive thevehicle. How to Add Coolant to the Coolant Recovery Tank If you haven't founda problem yet, but the coolant level isn't at FULL COLD, add a50/50 mixture of clean water (preferably distilled) and DEX-COOL@ engine coolant at the coolant recovery tank. (See "Engine Coolant" in the Index for more information.) 5-16