How to flush a 1993 Buick Regal Radiator?

It's best to remove the radiator and take it to a shop to have them do it professionally. It usually doesn't cost too much and they can make any minor leak repairs while they're at it. When they're done your radiator will be as good as new. Chemicals and power flushing of radiators will only remove loose material. If you have any compacted sludge in the radiator tubes you will not be able to flush them out without having the professional take care of it for you.