How do I flush the radiator in a 2002 Buick Rendezvous. Need all the steps.

Well you can purchase a Prestone Flushing Kit, that includes a T valve with a cap that you can remove to connect a garden hose to, that you would install in line in one of heater hoses. Install the T valve, connect a garden hose to the T valve, remove the radiator cap and turn on the garden hose, once you have clear water coming out the radiator, turn off the hose and disconnect it and install the T valve cap. Then on the other tank that doesn't have the radiator cap, at the bottom of that tank, is a petcock, unscrew it to drain the radiator. Drain the water out and close the drain and refill the radiator.