How do you flush the coolant system on a 1993 Pontiac Grand Prix LE 3.1?
You can take it to a shop. they will charge you maybe 20 or $30 but it flushes and refills your radiator. Get a flush kit from a part store and follow the simple directions.
Open the radiator petcock and drain coolant into a container. Dispose of all coolant properly as it is toxic to animals. Close petcock and fill system with water. Run the engine for several minutes with the heat on high. Drain the system again. Several repeats of this procedure will flush the radiator and engine for the Firebird.