"have taken the cap off with the engine running and the fluid started flowing out why I assumed it wasnt the pump "......that just means pressure is building up in the system....
Does your gage start at 100, and gradually go up, or does it jump up quickly? Is your cooling fan working?
When this thing overheats, via the temp gage, do you get any heat out of the vents with the temp set all the way up? If no, there is an air pocket being formed, sounds like a possible head gasket...