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There are several methods for flushing the cooling system on ALL engine cooling systems. Time honored is drain the radiator (drain ****). Fill with fresh water and run engine to operating temperature until cooling fans turn on. Drain cooling system again. Refill with 50-50 coolant. Another method is purchasing a "T" vlave (coolant flush/service kit) from Autozone, PepBoys, NAPA, O'Reilys, CarQuest, etc.). This "T" valve is installed in one of the heater hoses & attached to a garden hose. Remove the radiator cap & turn on the water supply to the garden hose. Let water run until flush water is 'clear'. Remove garden hose from T valve & refill radiator with pure coolant until the T valve drainage turns green/orange. Install T valve cap... DONE!
The radiator should have a valve on the bottom that will turn 90 degrees and will allow the coolant to flow out they can be hard to find sometimes but trust me there is a drain it will look like a butterfly valve and can also be plastic in some vehicles
locate the drain plug usually a plastic butterfly plug on the back side of your radiator but make sure to cool off the coolant first as this could give a serious burn. turn its counterclock wise and bingo drain the water off..
Some models do not have a petcock, pulling the lower radiator hose will suffice in drainage. I suspect you know what you are doing since you have the correct nomenclature. Use extreme caution during this type of draining procedure when coolant is hot. If it is not on the lower left or right corners of radiator side facing engine, it is not equipped with a drain valve.
if your under your car look at the bottom right side of the radiator( could be left side, not likely though) its white and plastic, kinda resembles a wing nut, unscrew it a little and...... DRAINAGE!!! oh you can also unhook the lowest tube in your overflow tank if u want to drain that aswell