1997 Buick Park Avenue Owner's Manual - Page 290

Checking Coolant t' ENG. COOLANT LOW CHECK LEVEL !HBIBNN If this ENG. COOLANT LOW-CHECK LEVEL message comes on, it means you're low on engine coolant. The coolant recovery tank is located on the driver's side of the engine compartment. When your engine is cold, the coolant level should be at FULL COLD or a little higher. When yourengine is FULL HOT or a warm, the level should be up to little higher.