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Quite likely your resistor is partial broken. It is usually a little rectangular ceramic looking unit inside or close to your blower motor in the blower housing, sometimes they are a little tricky to find. More than likely it will look cracked but is still holding together at this point, it can only get a little worse (as in completely break and no blower). They just wear out under normal use in modern vehicles and frequently need to be replaced from anywheres from about 4-7 years, at least that's what it's been in my vehicles.

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Q: Why does your heater in car only blows on high?
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