1996 Pontiac Firebird Owner's Manual - Page 269

NOTICE: If you use an improper coolant mix, your engine could overheat and be badly damaged. The repair cos't wouldn't be covered your by warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a year, have your dealer check yourcooling system. Checking Coolant NOTICE: If you use the proper coolant, you don't have to add extra inhibitors or additives which claim to improve the system. Thesecan be harmful. 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 engineis warm, the level on thedipstick should be up to HOT, or a little higher. 6-28