1999 Pontiac Firebird Owner's Manual - Page 278

yellowblue Checking Coolant 5.7L V8 Engine Only If this light comes on and stays on, it means you're low on engine coolant. If you need more coolant, add the proper DEX-COOLR coolant mixture at the coolant recovery tank, but only when your engine is cool. If the tank is very low or empty, also add coolant to the radiator. See "Engine Overheating" in the Index for information. Adding Coolant to the Recovery Tank The vehicle must be on a level surface. When your engine is cold, check the dipstick on the cap of the coolant recovery tank. The coolant level should be at COLD, or a little higher. When your engine is warm, the level on the dipstick should be up to HOT, or a little higher. 6-30