1994 Buick Roadmaster Owner's Manual - Page 244

To Check Coolant When your engine is cold, the coolant level should be at the "FULL COLD." I If thklight comes on it means you'relow on engine coolant. 'i .. . . When replacing the pressure'cap,make sure it is tight. .. Surge Tank Pressure Cap I NOTICE: To Add Coolant If you need more coolant,add the proper mixat the s m , but only when the engine is cool. Your radiator cap is a 15 psi (105 kPa) pressure-type cap and must be tightly installed to prevent coolantloss and possible engine damage from overheating. When you replace your radiator pressure cap, an AC* cap is recommended.