1996 Pontiac Bonneville Owner's Manual - Page 270

If this light comes on, it means you'relow on engine coolant. A CALJTION: lhrning the radiator pressure cap when the engine and radiator are hot allow steam and can scalding liquids to blow out and burn badly. you With the coolantrecovery tank, you will almost never have to add coolant at theradiator. Never turn the radiator pressure capeven a little when the engine and radiator are hot. LOW COOLANT -- -- Adding Coolant If you need more coolant, the proper mix at the add coolant recovery tank. Add. coolant mix at the recovery tank, but careful not be to spill it. r I You can be burned if you spill coolant,on hot engine parts. Coolant contains ethyleneglycol, and it will burn if'the engineparts arehot enough. Don't spill coolant on a hot engine. 6-25