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Does the heater relay in the relay box under the hood click when the blower switch is moved to any position. Do you have 12 volts on either of the wires at the blower motor?
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The blower motor is on the passenger side up under the glove box. The end is about 3 inches around and 1 electrical connector. Do you have a 12 volt test light or voltmeter. The most common problem is the blower motor.
I would definitely check the fuses but the relays rarely ever go bad.