Replace an overheated or corroded rear blower resistor with the Dorman blower motor resistor kit, part number 973-558, built as a direct replacement for the 2007-2014 Ford Expedition and 2007-2014 Lincoln Navigator. The resistor controls the current reaching the blower motor, which is how the lower fan speeds are set. When the original resistor fails, the rear fan can lose some or all of its speed settings.
This Dorman hvac blower motor resistor kit pairs a new resistor with a harness pigtail, so the connection comes in the same box. The pigtail is essential for most repairs.
- Direct replacement: designed to directly replace the original equipment resistor on the listed Ford and Lincoln applications.
- Resistor and pigtail together: each kit includes both a resistor and a harness pigtail.
- Performs like the original: made to work like the original equipment. If a failed resistor is causing your rear HVAC problem, this kit replaces it.
- Engineering support: Dorman's US-based team of engineers and quality specialists stands behind the design.
Signs this part may need replacing include a rear blower that runs only on its highest setting, missing fan speeds, or a rear blower that will not run at all. A blower motor, switch or wiring fault can cause the same symptoms, so diagnose the cause before replacing the resistor. See the "Vehicles it fits" section for full fitment details.
Interchange: 4P1591 · RU1324 · 7L1Z19A706A · 20490 · RU634 · JA1714
This part cross-references / interchanges with the following part numbers:
4P1591, RU1324, 7L1Z19A706A, 20490, RU634, JA1714
Frequently Asked Questions
Will this kit fit my 2007-2014 Ford Expedition or 2007-2014 Lincoln Navigator?
It is a direct replacement for the rear blower motor resistor on the 2007-2014 Ford Expedition and 2007-2014 Lincoln Navigator. Check the "Vehicles it fits" section to confirm your exact vehicle.
What does a blower motor resistor do?
It regulates the current sent to the blower motor, which is how the lower fan speeds are produced. This kit is for the rear HVAC blower.
What comes in the kit?
Each kit includes a resistor and a harness pigtail. The pigtail is included because it is essential for most repairs.
What are signs the rear blower motor resistor may need replacing?
Common signs are a rear blower that works only on high, missing fan speeds, or no rear fan at all. A motor, switch or wiring fault can cause similar symptoms, so diagnose the cause first.
How is the kit installed?
The resistor takes the place of the original rear blower resistor. Follow the vehicle service information for access, removal and connecting the included harness pigtail.
