blower will not work on heater or ac setting on 2001 Kia Sephia

can you tell me if a bad resistor would make that happen or is it the blower motor , have already checked all fuses

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also, do you know what would cause the gear shifter buttom will not go in so i can shift gears and how to fix that problem, besides the obvious that the car is a junker and has 160, 000 plus miles on it , it does still run