If My 2001 and your kia have the same dashboard a needle width should be normal !
When my 01 started going almost down to the cold side it needed a new thermostat ! also
check hoses and coolent --as far as fan goes I believe my engin is a bit different !
In New Joisey we have a wide variation of tempertures from winter to summer !
Living in a swamp / marsh isnt easy for an old timer like me to doo repairs at times !
Winter is too cold and we have flesh eating bugs in summer ! I would go with the stat
but check hoses at least every year !