1996 Buick Park Avenue Owner's Manual - Page 274

Checking Coolant COOLANT LOW Adding Coolant If this light comes on, it means you're low on engine coolant. I you need more coolant, add the proper mix at the f coolant recovery tank. The coolantrecovery tank is locatedat the left of the engine compartment. When your engine iscold, the coolant 'level should be at F'ULL COLD or alittle higher. When your engine is warm, the level should be up to F'ULL HOT or a little higher.