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If the blower in your 2004 GMC Sierra won't shut off, it could be due to a faulty blower motor resistor or a stuck relay in the HVAC system. Another possibility is a malfunction in the climate control module or the wiring harness. To troubleshoot, check the blower motor relay and the resistor for any signs of damage or failure. If the problem persists, it may be best to consult a professional mechanic for further diagnosis and repair.

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AnswerBot

1mo ago

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