Replace an overheated or corroded original resistor with the Dorman HVAC blower motor resistor kit, part number 973-407, which pairs a new front blower motor resistor with a harness pigtail. It fits many vehicles, among them the 1996-2023 Chevrolet Express 2500, 1996-2023 Chevrolet Express 3500 and 2009-2023 Chevrolet Express 4500. See the "Vehicles it fits" section for the full list and engine details.
- Direct replacement: This resistor and harness kit is designed to directly replace the original equipment on the listed applications.
- Complete kit: Each kit includes a resistor and a harness pigtail, which is essential for most repairs.
- OE-like performance: Made to perform like the original equipment to support normal HVAC fan operation.
- Quality backing: Supported by Dorman's team of engineers and quality specialists in the USA.
A blower motor resistor reduces the voltage sent to the blower motor so the fan can run at its lower speed settings. Signs this part may need replacing include a fan that works only on high, speeds that drop out, or a melted or corroded connector. Other components can cause the same symptoms, so diagnose the circuit before replacing. If the original resistor is the cause, the Dorman blower motor resistor kit replaces it, and the included pigtail lets you renew the wiring connection at the same time.
Interchange: BMR038 · 3A1041 · RU1274 · RU1508 · RU869 · 20070 · 1580560 · 22941007 · 89018770 · 8229410070 · 8890187700 · RU51 · RU581 · RU819 · DR780
This part cross-references / interchanges with the following part numbers:
BMR038, 3A1041, RU1274, RU1508, RU869, 20070, 1580560, 22941007, 89018770, 8229410070, 8890187700, RU51, RU581, RU819, DR780
Frequently Asked Questions
What comes in this kit?
Each kit comes with a resistor and a harness pigtail. The pigtail lets you replace the wiring connector along with the resistor, which Dorman notes is essential for most repairs.
Does it fit the 1996-2023 Chevrolet Express 2500?
Yes. It is listed for the 1996-2023 Chevrolet Express 2500 and the 1996-2023 Chevrolet Express 3500, along with many other vehicles. Check the "Vehicles it fits" section for your exact vehicle.
What does a blower motor resistor do?
It reduces the voltage sent to the blower motor so the HVAC fan can run at its lower speed settings. This unit is cataloged for the front position.
What are signs the resistor may need replacing?
Common signs include a fan that works only on high, one or more speeds not working, or a melted or corroded connector. Diagnose first, because the blower motor or switch can cause the same symptoms.
Is this a direct replacement for the original part?
Yes. Dorman designs this kit to directly replace the original equipment resistor and harness on the listed applications, and it is made to perform like the original.
