Leaking!!!!!

Yesterday I was out cruising, and right as i was turning down my road I punched it to WOT for a couple of seconds and then brought it down. I smelled antifreeze and noticed fluid leakind from under the dash on the passenger side mat and from the heater box. I just had the heater box replaced, so what is causing this problem??? Thanks for any help.

Leaky heater core..........

Room ROOm pop ,no restrictors in the hose!! or it may be a loose clamp om the fire wall side and no sealant installed on last replacement.

I would look at the install of the heater box first.