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Answer Obtain a prestone flush kit and a container of fast acting flush plus 2 gallons of antifreeze. You will be splicing the tee fitting in your return heater hose ( the cooler of the two hoses), draining the existing coolant, filling with straight water and flush to the radiator, running the engine for ten minutes with the heater on full then hooking up your garden hose to the adapter that comes with the kit. After you have run it the clean water thru it, the radiator and engine will be nice and clean; then drain the pure water and add 50/50 antifreeze and water mix and your done. I hope this helps you. Mark
Following the above procedure, I would recommend adding the first gallon of straight antifreeze in without mixing with water because you will not have drained the engine block by simply draining the radiator. So you still have at least one gallon of clear water in the block to mix with one gallon of straight antifreeze. Add the rest with a 50/50 mix for protection down to -34 degrees F.
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