Ford Repair: engine coolant, engine coolant, freeze plugs

Question
 I am puzzled at the coolant in my 99 taurus. It has turned all brown looking again. It has been a year or so since i had it flushed and it is brown again. They had to flush it twice last time to get it cleaned up. What is going on with this vehicle?  

Answer
Hello and thanks for the question...I'll try to help.
 That is a very common problem with the Taurus, I don't know why. My dad's Taurus did the same thing, and also had eaten through the freeze plugs. I would get it power flushed and a lubricant added to it on refill.
Hope this helps,
Erik