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Try wiggling the electrical connector at the blower resistor. If wiggling this connector makes the blower go on and off, turn everything off and replace the connector before anything catches fire and burns the truck down.
Next, when the blower is not working, set the fan speed to hi and try gently tapping the blower with a hammer. It that makes the blower come on the blower motor is bad and should be replaced. Also, use a test light or voltmeter to check for voltage across the two wires at the blower motor when it won't work. If voltage is present but motor won't work, motor is bad.
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