Not cooling properly

I have a 1995 Jeep Grand Cherokee 5.2
L V8 engine. Recently my jeep has
started to overheat but does not let off
and overheating smell. When I'm
driving the temperature gauge
progressively climbs all the way into
the red and then slowly starts to cool
down. It goes back and forth from
cooling down heating up for about 10
minutes until the temperature gauge
goes back to normal driving
temperature. I recently flushed the
radiator and changed both top and
bottom radiator hoses. I replaced the
thermostat a few months back but I
heard that those can go out pretty easy
depending on if you get a bad
thermostat or not. When I go to park
and turn off my vehicle sometimes it
leaks coolant.