If an overheated or corroded resistor has left your climate control fan misbehaving, the Dorman hvac blower motor resistor kit, part number 973-405, replaces it with a front blower motor resistor and a matching harness pigtail. It fits many GM trucks and SUVs, among them the 2003-2006 Chevrolet Silverado 1500, 2003-2006 Chevrolet Silverado 2500 and 2003-2006 GMC Sierra 1500. See the "Vehicles it fits" section for the full list.
The blower motor resistor sets the fan speeds of the heating and air conditioning system by controlling the voltage delivered to the blower motor. Dorman supplies the resistor together with a harness pigtail to replace a failed original equipment resistor on the listed applications.
- Direct replacement: this resistor and harness kit is designed to directly replace the original equipment on the listed applications.
- Resistor plus harness pigtail: every kit comes with both pieces, and Dorman notes the pigtail is essential for most repairs.
- OE-like performance: made to perform like original equipment, intended to return full HVAC operation when the resistor is at fault.
- Engineering support: backed by Dorman's team of engineers and quality specialists in the USA.
Signs the blower motor resistor may need replacing include a fan that works on only some speed settings, runs only on its highest setting, or does not run at all. The blower motor, switch or wiring can cause similar symptoms, so diagnose the cause before replacing parts.
Interchange: 15-81086
1581086 · 4P1449 · RU1264 · 20339 · 22807123 · 89018308 · 89018596 · 89019088 · RU571 · JA1582
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
15-81086, 4P1449, RU1264, 20339, 22807123, 89018308, 89018596, 89019088, RU571, JA1582
Frequently Asked Questions
What comes in the Dorman blower motor resistor kit?
Each 973-405 kit includes a front blower motor resistor and a harness pigtail, which Dorman describes as essential for most repairs.
What does a Dorman blower motor resistor do?
It controls the voltage sent to the blower motor so the HVAC fan can run at different speed settings. If the original resistor has overheated or corroded, this part replaces it.
What are signs the blower motor resistor may need replacing?
The fan may work on only some speeds, run only on high, or not run at all. A blower motor, switch or wiring fault can cause similar symptoms, so diagnose the cause first.
Will this fit my 2003-2006 Chevrolet Silverado 1500?
Yes. The 973-405 is a direct replacement for the 2003-2006 Chevrolet Silverado 1500, 2003-2006 Chevrolet Silverado 2500 and 2003-2006 GMC Sierra 1500. See the "Vehicles it fits" section for other vehicles.
Why does the kit include a harness pigtail?
Dorman pairs the resistor with a harness pigtail because the pigtail is essential for most repairs of an overheated or corroded original resistor. Follow the vehicle service information when installing it.
