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What causes the interior ventilation fan to work only at maximum speed on a Pontiac Montana 2000?
Senecaljg
It is more likely that your blower resistor is burned out, which controls fan speed by "resisting" how much amperage makes it to the blower motor, depending on which speed your switch is on. High speed goes straight through with no resistance, the lower the speed the more resistors it is routed through, to slow the blower motor. Therefore, if your fan works on high speed and nowhere else, the motor is good but the resistor pack is completely fried. If a couple of speeds work but not all, it is partly fried. Check your manual for location of this component (usually on the blower box) and replace it.
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∙ 14y ago
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