1994 Pontiac Firebird Owner's Manual - Page 168
1994 Pontiac Firebird Manual
Page 168 highlights
How to Add Coolantto the Radiator (5.7L LT1 (Code P) Engine) NOTICE: The LTl engine (Code P) has a specific radiator fill procedure. Failure to follow this procedure could cause your engine to overheat and be severely damaged. 6. Start the engine and let it run until you can feel the upper radiator hose getting hot. Watch out for the engine fan(s). 7. By this time the coolant level inside the radiator filler neck may be lower. If the level is lower, add more of the proper mix through the filler neck until the level reaches the base of the filler neck. Then replace the pressure cap. At any time during this procedure if coolant begins to flow out of the filler neck, reinstall the pressure cap. Be sure the arrows on the pressure cap line up likl this. 167 ...