There are many possible causes for overheating. Your radiator may be obstructed from leaves or debris in front of it. It may be dirty inside and obstructed. A radiator hose may have collapsed. Your water pump may be bad. You may have a bad head gasket. You may have a bad thermostat. There could be other things, too.
Your car is 11 years old and ripe for any of the above. Check the ones you can based on your own mechanical ability and repair any deficiencies you find. If that doesn't do it, seek professional help.
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