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Originally Posted by Gordo
Unless you remove the (2) drain plugs from the engine block, draining just the radiator will leave several qts of coolant in the block. That may explain the missing 2 gallons of coolant.
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Gordo is on the right track.
Forget removing the drain plugs from the block. Flush the system until you have clean, clear water coming out where you are letting it flow out. Then figure out your capacity. You have that - 21 quarts. Put everything back together then pour half your total capacity of PURE anti-freeze in the system. Then all you have to do is top it off with plain water - perferrably distilled water. Then you have a perfect 50/50 mix.
Once again:
Flush until clean water flows out.
Fill 1/2 the total capacity with straight anti-freeze.
Fill to full with straight water.
For whatever reason this is the first thing my dad taught me about engines.