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To expound on this. What happens is resistance builds in the circuitry behind the switch and overheats the metallic elements inside the switch, causing the plastic in the switch to melt. This causes sporadic operation at any speed or only at certain speeds, and the owner may have to work with the fan speed switch itself to make it work. The underlying problems that CAUSES the resistance may be several things, but the root of the problem is usually the blower motor going bad. This builds resistance inside the blower motor, which also builds in the circuit. Replacing the fanspeed switch will only mask the problem and burn out the new switch. The proper fix for this instance is the motor.

EDIT: I have researched this and found that it seems to be the resistor that causes the majority of these problems, rather than the blower motor. Do know, however, that either of these can cause this problem.

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14y ago
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Q: Why is the blower motor on a Kia Rio not running?
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