2006 4cyl. coolant leak ?

My wifes 2006 vue with the 4 cyl left a green puddle under the engine when she left for work today. It looks like and smells like coolant, but this engine has Dexcool coolant which is a reddish color. What could this be?

it's a/c dye.the dye itself is green.it's put in from the factory to help isolate an a/c leak.

Thanks for the reply. I took the car in to the dealership to be checked out because it is still under warranty. They said they could not find anything leaking. We will see. They are probably banking on the car being out of warranty before we need to use the AC again. I kept the service order to show that I had it in to be checked for this just in case.

A leaking a/c line would not cause a puddle under the car unless it blew a line right off. I sepect it is dye in the coolant, have you had this vehicle since new?

Yep, I have owned this vehicle since new.
I haven't seen anymore signs of this mysterious fluid since the initial discovery but I am still suspect about this.....