1995 Buick Century Owner's Manual - Page 223

Adding Coolant To Add Coolant If you need more coolant, add the proper mix at the coolant recovery tank. If the coolantrecovery tank is completely empty, add coolant to the radiator. (See "Engine Overheating" in the Index.) The coolant recovery tank is located on the passenger's side of the engine compartment. To Check Coolant When your engine is cold, the coolant level be at should ADD or a littlehigher. When your engine is warm, the higher. level shouldbe up to FULL HOT or a little 6-19