color is irrelevant - it's chemistry that matters. there are a number of high quality non-silicate anti-freezes on the market, no two with the same color afaict. if you /knew/ what was in there, maybe you could stop worrying.
there's two drain plugs - bottom right of the rad [left if you're facing the engine] and the drain plug on the engine block. if it's a d-series, it's a largish hex plug lower left as you face the motor. you'll need a new gasket when replacing. and you'll need to repeat this process at least twice - the coolant in the climate control system never drains.
one last thing - don't use tap water when refilling, use distilled.