XJ overheating when stopping
When I first bought this XJ, I opened the radiator cap and overflow reservoir and it looked all sluggy, so I flushed it with water, ran the heater for a bit, running water from the top, letting it flow out the drain cap at the bottom of the radiator, closed the drain, filled it with water, let it cool, and replaced the fluiability about 70/30. A couple of weeks later, my lower hose blew a hole while I was out, so I bought some repair tape, filled it back with fluid and water, and made it home, about an hours drive. As soon as I turned off the truck, the lower hose blew out past the tape, but at least I made it home. I bought a new hose, new fluids, and thought I'd replace the thermostat at the same time. Today I drove about 2 hours, and when I stopped, the temp gauge pegged to red and I could hear bubbling under the hood, but it didn't lose any fluid. I ran the heater, which dropped the temp back to normal, then shut it off while I went to the ear doc, but had to drive another hour to my next destination, and when I stopped there, it heated up again, but not as bad.
My question is when I replaced the thermostat, I used a 195 degree unit, but noticed the PO had a 160 unit installed. Normally the XJ runs around 210-215 but not higher. Should I have replaced the thermostat with another (or the same) 160? I'm concerned that it's going to keep overheating and maybe there's another problem that I'm not seeing?