Car oberhearing

I just replaced my thermostat in my 2007 chrysler
sebring 2.7L V6. It jas been roughly a week or so
and my car started to overheat again and now the
A/C is starting to act odd. The A/C will blow cold
when I am driving at higher RPMs and at lower
RPMs it doesnt blow cold, The heater worked like a
xharm when I first fixed the thermostat and now it
seems to be broken as well. I popped the hood and
did a quick self diagnostic and the coolant was not
completley full but no where near low and the
lower raidiator hose which runs to the thermostat
was sucking I could literally see the hose
collapsing on itself as if no actual coolant was
flowing through and it was air bound? I really dont
know what to do please help.