How do you flush and fill a radiator for a 1998 Cadillac sedan sts on 1998 Cadillac Seville STS

What type of coolant do i use, what are the steps to follow in doing the flushing myself

1 answer
it would be easier to remove the lower hose, catch the coolant and dispose of it correctly.
change the thermostat as well. use dexcool coolant. do a 50-50 mix.

Roy