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For most GM trucks or SUV's, it's under/behind the glove box. But the most GM motors do not have multiple speed capacity. That is usually a function of the switch. Many of the GM multi speed vehicles use the heater function switch assembly to control motor speed. Unfortunately, many of them are "solid state" and require that the entire heater function switch be replaced when something goes bad.

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Q: Where is the ac heater blower located under the dash or under the hood at the firewall it does not work on low speed only the other speeds work fine would this be the motor or switch?
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