No heat causing overheat?

What is your question?

I recently have an overheating problem, the heating recently does not work and when the heat or ac is on, the car overheats. So I can’t figure out if it’s a leak in the hose or the heating core. And it seems to be okay if I stay under 45 miles p/h. Any help is appreciated

What makes this problem better or worse?

When speeding up and staying at a high speed

How long has your 2014 Chevrolet Sonic had this problem?

A couple days