How to drain radiator fluid in 1990 Cadillac Eldorado?

To drain the radiator fluid in a 1990 Cadillac Eldorado, start by ensuring the engine is cool and then locate the radiator drain valve at the bottom of the radiator. Place a drain pan underneath the valve, open the valve, and allow the coolant to completely flow out. After draining, close the valve and refill the radiator with the appropriate coolant mixture. Always dispose of the old coolant properly, as it is hazardous to the environment.