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Usually a drain plug at bottom of radiator
There are three. One for the engine oil. One on the bottom of the radiator and one on the back of the block, Both for antifreeze.
Use the Gold antifreeze. It lasts longer and does not cause corrosion to the cooling system.
Most all cars of that year and later use the orange extended life coolant . it is used for the newer aluminum block engines and is good for 50000 miles
There is a pitcock valve on the bottom of the radiato. On the side facing the engine. It has a T shaped handle that you can unscrew to drain the radiator, and by default the engine block. You may have to use pliers to unscrew the plug, over time dirt and corrosion can make it dificult to loosen.
Bottom of radiator.
you get a friend to hold it whilst violently beating it xx
lorftion drain plags 3.0 l Ford
Drain plug is located on the bottom of the radiator Right hand side.
Small plug on the bottom left(view from front) of the radiator.
Sometimes they use that threaded drain plug location to attach a knock sensor. So if you see a knock sensor threaded into the side of the block that may be where the coolant drain is located.
Wear is drain plug on 1997 GMC 7.4