Hey, first of all, for all you out there that have or are running Dexcool in your vehicle, this is a GM engineered fluid which doesn't really live up the clout. This extended life coolant has allot of problems. It must be mixed with distilled water to ensure the long-life qualities it boasts. If mixed with regular water, there is a very strong likelihood  that it will turn to mud very quickly. Personally I feel that the Zerex Gold product(also a long-life coolant) is significantly better. Traditional green coolant is fine for almost any application but I prefer to use Prestone's Eco-Safe version which is similar in chemical composition to the Zerex Gold but is a little less abrasive on the environment if it escapes its intended home. Anyway, to flush your own coolant, you will first need a few things. Obviously you will need something to catch it in and seal it to transport it to your local coolant recycling center. Next, you will most likely need a really good thick pair of gloves, I prefer a thick cowhide leather pair but for the inexperienced do-it-yourself-er,  I'd strongly recommend using leather gloves with thick rubber gloves over them. You will almost certainly need either a good pair of pliers or a socket depending on the style of drain plug on your radiator. Please note that alot of these drain plugs are very fragile and often seize up when not serviced properly. It is usually also effective to simply disconnect the lower radiator hose from the radiator and let the system drain this way, sometimes it may be your only option, and if you don't trust yourself not to break the drain plug, or just don't want to risk it, it's your BEST option. Depending on the level of deterioration of your system, you may want to consider purchasing a coolant flush solvent. Whether you are using a solvent or not, You should definitely consider replacing your thermostat and radiator/coolant reservoir cap, they aren't expensive and it is recommended that you replace both anytime you flush the coolant anyway. Usually this is not very hard and the shade tree can handle this pretty easily but there are allot of Audis, GM V6's, mitsubishi/dodge 4cyl.'s, and many others that should only be tackled by an experienced technician because of the complexity of the job. Anyway, drain the system, fill it back up with water(also the solvent) and crank it up, top it off, cap it, and let it run for 3-10 minutes(or until the thermostat opens up indicated either by a very slight up and down fluctuation of the temperature gauge, or you can tell when the hose leading awy from the thermostat gets hot, usually the upper, then let it run an additional minute or two.) Shut it off, let it cool a little, probably about five minutes, and VERY CAREFULLY drain it again. Repeating this process 2-5 times may be necessary to remove ALL the GUNK caked up in a severely neglected system. Once you are satisfied that the  fluid last drained is clear and clean enough, keep in mind that there is probably still about a gallon of water still in the system, keep this in mind when mixing, I usaully would add only about 3/4 to one whole gallon of pure strength coolant before mixing to add. If your reservoir bottle is nasty or caked up with junk, clean it out too. Always replace the coolant in the reservoir also. Now run the vehicle with the cap off and top it off to your satisfaction, IF THE SYSTEM HAS ANY BLEEDER SCREWS, THIS JOB IS PROBABLY BEST LEFT TO A PROFESSIONAL, these can cause air pockets and severe overheating if not done properly!!!! Check with your local auto parts store, maybe two or three of them, and ask around to see if your system has bleeder screws(ALLOT OF lat 80's to current GM V6's have these screws, most have more than one, so be careful!!!!  Now you have flushed your coolant. IT's never a bad idea to overfill your reservoir bottle a little past the MAX line because the system WILL suck some down. Always keep a close watch on the level of the bottle for a few hundred miles of driving after you've performed this service! Hope this helped you! If so, Please vote below and check out my other guides, also please check my auctions for GREAT DEALS!