Rear Tire Rims Get Hot

I have a 2006 Jeep Liberty Sport with a 3.7L engine and 160,000 miles. Recently I had driven about 50 miles and noticed smoke coming from the left rear area when I stopped at a red light and it had a strange odor. I pulled into a parking lot and stopped and the rear Tire rims was exceptionally hot and so were the brakes. I took it in the next day (2 weeks ago) and had the brakes checked, pads replaced and front wheel bearing repacked. Today when I got to work I smelled that odor again and touched the tire rims and they were hot again. Any suggestions on the cause?