Sr20 heating and cooling issue

[bmxfreax199]

So I've got a sr20 in a s14 and if I get on it it wants to over heat, when I'm just crusing in it the temp stays down but I have no heat unless I'm sitting at an idol. I've replaced a few of the hoses, thermostat, a thermostat housing, now idk if it's from not bleeding it or what it could be. I've checked the oil that seems good, I've checked the plugs they don't seem to be washed out. But some how I'm still losing antifreeze and idk what's going on if anyone can give some suggestions or point me in the right direction that would be great.
Thanks guys