Have a 2000 F350 with a V10,Had a new water pump, upper & lower hoses replaced a couple weeks ago. Noticed yesterday a puddle of coolant passenger side behind the front tire!! Had to take the front inner tire liner out & found a black Plastic box with a "smaller" outlet dripping fluid.
Might be the heater but not sure. Any suggets
Thanks

 

That would be the location of the heater core. keep in mind that your ac goes to that area as well.

How do you know it is coolant vs ac condensation?

Have you been loosing coolant? Or is the fluid the color/smell of coolant?

 

It was a green fluid-Iam "***"uming it was anti-freeze

 

Yup...hate to say it but it sounds like your heater core is out to lunch.