Replace an overheated or corroded rear blower motor resistor and its connector in one job with the Dorman hvac blower motor resistor kit, part number 973-478. It fits many vehicles, among them the 2002-2004 Ford E-150, 2003-2004 Ford E-150 Club Wagon and 2003-2004 Ford E-250. See the "Vehicles it fits" section for the full list and engine details.
A blower motor resistor helps set the blower's fan speeds by changing the current that reaches the motor. This Dorman blower motor resistor comes paired with a harness pigtail, so the connector can be renewed along with the resistor.
- Direct replacement: this resistor and harness kit is designed to directly replace the original equipment on the listed applications.
- Kit contents: each kit includes a resistor and a harness pigtail, which Dorman notes is essential for most repairs.
- OE-like performance: made to perform like the original equipment, and intended to return normal HVAC blower operation when the resistor is the cause of the fault.
- Quality backing: supported by Dorman's team of engineers and quality specialists in the USA.
Position: Rear.
Signs this part may need replacing: the rear blower runs on some speed settings but not others, or does not run at all. A failed blower motor, switch, fuse or wiring can cause similar symptoms, so diagnose the cause before replacing the resistor.
Interchange: 4P1386 · E8UZ19A706A · E8UZ19A706BA · 20261 · JA1524
This part cross-references / interchanges with the following part numbers:
4P1386, E8UZ19A706A, E8UZ19A706BA, 20261, JA1524
Frequently Asked Questions
What does the Dorman blower motor resistor kit do?
It replaces the rear blower motor resistor, which helps set the blower's fan speeds. A harness pigtail is included so the connector can be replaced at the same time.
What comes in the box?
Each kit contains a resistor and a harness pigtail. Dorman describes the pigtail as essential for most repairs.
Which vehicles does part 973-478 fit?
It fits many Ford models, including the 2002-2004 Ford E-150, 2003-2004 Ford E-150 Club Wagon and 2003-2004 Ford E-250. Check the "Vehicles it fits" section for your exact vehicle.
What are the signs of a failing blower motor resistor?
The rear blower may run on only some speed settings, or not at all. A bad motor, switch, fuse or wiring can cause similar signs, so diagnose the cause first.
Where does this resistor install?
It is cataloged for the rear HVAC blower position. Follow the vehicle service information for removal and installation, including connecting the new harness pigtail.
