Q: Climate control fan is no longer adjustable.

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I have a 1999 Dodge Intrepid. Lately the heater fan is always on in one position (as soon as you turn the key) and turning the fan speed knob has no effect. Even though the display isn't working (needs solder fix), the temperature is adjustable (automatic and manual) and the vents are changeable (defrost, floor, etc.). Can you tell me what the fix is for this? Could it be the blower motor resistor?

My car has 110000 miles.
My car has an automatic transmission.

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