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I had the exact problem with my Dakota. It was the Fan Resistor - Should be a circuit card located at the fan motor. High speed bypasses the resistor, but the others use the resistor to slow down the fan speed. It cost me about $5 and was very easy to change.

Did a little research. I'm pretty sure that is what it is.

From the 04 Ram service Manual

BLOWER MOTOR RESISTOR BLOCK
DESCRIPTION
The blower motor resistor is mounted to the bottom side of the HVAC housing near the blower motor.It can be accessed for service from underneath the instrument panel.
OPERATION
The resistor has multiple resistor wires, each of which will reduce the current flow to the blower motor to change the blower motor speed by changing the resistance in the blower motor ground path. The blower motor switch directs the ground path through the correct resistor wire to obtain the selected speed. With the blower motor switch in the lowest speed position, the ground path for the motor is applied through all of the resistor wires. Each higher speed selected with the blower motor switch applies the blower motor ground path through fewer of the resistor wires, increasing the blower motor speed. When the blower motor switch is in the highest speed position, the blower motor resistor is bypassed and the blower motor receives a direct path to ground. The blower motor resistor cannot be repaired and, if faulty or damaged, it must be replaced.
 

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