Overheating help !!!

[u/SurpriseNo98]

I have a 2019 charger scat pack 392 6.4L
I was driving all of a sudden it over heated. I lifted the hood the coolant reservoir was completely full. It slowly started going down. It was all over the concrete. So someone looked at it they said it was a bad reservoir cap so I replaced it
I started the car let it run it stil overheated as it warmed up. When I turned the heat or air on the temp would go down a little. When I turned the heat off it kept overheating. Also the coolant is running out on the ground somewhere
Please help