i have a 96 aurora.. today i noticed my rr wheel somtimes chirping...when i got home i removed the wheel and the rotor was very hot while the other wheels had cooled,it seemed to turn freely enough...am i getting a somtime seizing caliper or a wheel bearing overheating

If you are seeing a lot of brake dust you have a sticking caliper. It is possible that you have a bad bearing but you should hear a noise if the bearing is going. I would change the caliper first to see what happens. This is easier and cheaper than the bearing and you will see immediate results. If that doesn't correct the problem then the bearing is the next item to change.