Q: My heater would not turn off at first and now my car is overheating. 2011 Dodge Nitro

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Last Sunday the car heater wouldn't turn off..it started making a rattling noise towards the front of the truck.this morning on my drive to my job.I forgot to close the hood properly.well the battery light popped on and when I stopped it was smoking like crazy.I let it cool down and started it back up and attempted to drive I got around the corner and noticed the gauge moving into the hot zone.it started running hot..I need help

My car has 115000 miles.
My car has an automatic transmission.

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