Legacy gtb overheating !!!!

Hi, I have been have overheating issue with my car now and I'm getting pissed. My car started overheating couple months ago and I sarted taking it appart. I replaced the waterpump and the rad. Now today was my first day taking it out, I checked the hoses and refilled it with coolant and made sure there was no bubbles. So i drove it for 3 hours and then out of nowhere it started over heating again and now im **** and dont know what to do. Any idea or suggestions ??? Pls help

I was stopped on the side of the high way I let the car cool down and added a bit of coolant again while the car was running at that time the car was showing cold but was blowing warm air and started driving it home was cold the whole way up to 5 min before I got home. Then it started warming up but now it was blowing cold there. When I got home i popped the hood and the overfill tank was showin more then before I left and now don't know what to do

And now I went back to the car and the coolant reservoir is empty not the overfill but the pressurized one but still shot some coolant into the overfill, I dont get it

You changed the water pump and radiator but not thermostat?

There's no thermostat in it

There's no thermostat in it

 

Well, there's your first problem.