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go to aurtozone and buy the $8 kit. all the instructions are there. basically all you do is add an adapter to your heater hose that allows to hook up a hose to it. then you open the drain **** on the radiator and crank the motor. hook up a hose to the adapter on the heater hose and crank your motor. turn on the water hose and let it run for a few minutes and let it wash all the crap out! a lot of times it is better to get a special chemical that you pour in over night and it is like Drain-O in which it starts to clean your cooling system and breaks down a lot of gunk, rust, oil, particle buildups, etc. then fluxh your system out.
the best way to fill a radiator is to pour in an entire gallon of anti freeze in then pour an entire gallon of water. then with a second full gallon of antifreeze, split it b/t the 2 bottles. when ou have them very close to them same fill the bottles up the rest of the way with water and you now have another 2 gallons of pre-mixed antifreeze that is easy enought to haul alround and you have to pay the extra $5 at the store for the pre-mixed stuff!