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When I turn the ac or heat on, I have to turn it to the highest setting for it to work. Does the switch need to be replaced or is it something else?
 

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If your talking about the fan speed there is a dropping resistor (usually easily accessible) that has burnt out. When you turn it on high it bypasses the resistor.
 

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Change the blower motor resistor. There is two types depending on if you car had manual or auto controls for the heat and ac. Its behind the glove and is pretty easy to change. Part usually between 20 and 90 depending which and what brand you go for.
 
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