Your red might be okay but not necessarily, probably not if it doesn't mention OAT. (You shouldn't mix the wrong type). The Ford spec standard is WSS-M97B44-D, and in my experience that can be found referenced on the label of anti-freeze concentrates along with other manufacturers' standards, so just look for it (###-A is wrong).
The Ford spec is for OAT long life, which is red, although I think the stuff Ford sell now is purple. The right spec from a retailer will probably still be red, but you shouldn't just get any old red - Toyota do a red long life coolant for example which is not the same. Research Organic Acid Technology if you're interested.
Yours is probably from-new coolant being a 2006 car but if you think it's been changed in the past and don't trust the person responsible then it might pay to flush the system and re-fill with what you know for sure is the right mixture.