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Just did that on mine. You can get the resistor at Autozone, but more than likely, your harness is fried. This is a common problem, but the harness is a dealer only item. The fix is easy, you'll need to take the cover off (big black plastic box under the dash). Just take the screws out & lower the box. You will need to cut the wires & splice the new harness in. Your harness will come with everything needed (connectors). The resistor cost around 20-25 bucks, but the harness will set you back about 100.

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Q: How do you replace a 2004 Chevy Tahoe Heater Blower Motor Resistor?
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