Why is my 4Runner spilling coolant while driving and continuing to overheat?

What is your question?

My 4Runner started overheating and I ended up having to replace the water pump. After that it ran fine for a week then started overheating again. Since then I have replaced the thermostat, taken thermaostst out and put back in several times, drained and refilled the radiator numerous times as well. I have taken the plugs out and they are all dry. Front heat is blowing cold but back heat works perfectly. The coolant s spilling into my overflow tank while I'm driving and m losing all my coolant. Thus my engine then overheats. What could be going on?...

What makes this problem better or worse?

Driving

How long has your 2000 Toyota 4Runner had this problem?

A month