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A resistor block controls the speed of the AC/Heater fan. These resistors are switched on and off in various combinations to create the different fan speeds. When the resistors burn out, your fan will only work on the "HI" setting. The "HI" setting doesn't use any of the resistors and that's why it works. These resistors are near the blower and the blower is beneath the dashboard on the pasenger side. A/C is probably fine. If you try the heater, it will show the same problem as your question.

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โˆ™ 2011-09-12 20:39:50
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