1993 Buick Regal Owner's Manual - Page 232

A -- CAUTION: Turning me raalaror pressure cap when the --1gineand radiator are hot can allow steam ana scalding liquidsto blow outand burn youbadly. With the coolant recovery tank, you will almos' never haveto add coolant at the radiator. Never turn the radiator pressure cap even alittle wt- +haengine and radiator are hot. -- -- If this light comes on, it means you're low on engine coolant. this light comes on, it means you're low on engine coolant (diesel engine only). Add coolant mix at the recovery tank, but be careful not to spill it. To Add Coolant: If you need more coolant, add the proper mix at the coolant recovery tank. can be burned if youspill coolant on hot gine parts. Coolant contains ethylene glycol, and it will burn if theengine parts are t enough. Don't spill coolant on a hot engine. IU 230