Recently picked up a pristine, two owner completely original 94 5.0. Car was extremely well kept, I test drove it and everything was fine. On my way home from purchasing it, about 30 minutes or so it started to overheat, as soon as I pulled over it started puking coolant and steaming. I did a radiator flush, radiator is new and flows fine, put a new 180 degree thermostat in, opened the screw on top of thermostat and burped it, checked water pump and it's flowing, all fins were in tact and fine, fan was working as well. After I did all that I drove it three or four times and it was fine, no over heating. However my last trip as about an hour and at the very end it started to overheat, I don't get it, it overheats after long rides sometimes, every time it starts to overheat the a/c blows warm, but if it's normal operating temp the a/c is cold? Does it need to be burped again? Is the coolant temp sensor the culprit? Also should add the heater core went and he had it bypassed. Please help me figure this out the car is beautiful condition and I have big plans for it but most importantly I need it to get to and from work!