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Q: heater blower switch on 1994 Ford Tempo

hello, i recently noticed the heater blower switch under the dash gets hot after turning on the blower and I even saw sparks at the base of connection. I am assuming I have to repalce the harness switch all together? I found out about this after noticing a faint cable burning odor while air was on. i wonder if this was a factory problem?
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The component that you may be looking at is the blower motor resistor and they do wear out. They are easily purchased and don't really cost much.
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