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Q: The fan, heat , and a/c does not work. The heater core has been diconnected. on 1991 Ford E-250

How does one repair this ? and How do you repair this ?
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I do not understand your question. Need more data. If the blower does not run, check the fuse, then the physical appearance of the blower resistor connector block. Using a test lamp, verify power at red wire of resistor connector. I the resistor is deformed, you can buy a blower resitor, and connector pigtail as a replacement. Basically, if you have power and ground to the blower it will run unless it has completely failed.
Since you state that all of the components are inoperative, I would begin with checking power distribution by first checking power to blower motor.
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