Replace an overheated or corroded factory resistor with the Dorman HVAC blower motor resistor kit, part number 973-586, which pairs a new resistor with a harness pigtail. It fits many vehicles, among them the 2008-2009 Mercedes-Benz E300, 2003-2009 Mercedes-Benz E320 and 2006-2009 Mercedes-Benz E350. See the "Vehicles it fits" section for the full list and engine details.
The blower motor resistor is part of the circuit that sets blower fan speed, so the HVAC fan can run at the different settings chosen on the controls. When the original overheats or corrodes, the fan may stop responding to some or all of those settings.
- Direct replacement: Built to directly replace the original equipment resistor and harness on the listed applications.
- Resistor and pigtail together: Each kit supplies both the resistor and a harness pigtail, which is essential for most repairs.
- OE-like performance: Made to perform like the original equipment. It is designed to bring back normal HVAC blower operation when the resistor is the fault.
- Engineering support: Backed by a team of engineers and quality specialists in the USA.
Signs a blower motor resistor may need replacing include a blower that works on some speeds but not others, a blower that runs only on its highest setting, or no airflow from the vents. The blower motor, control switch, fuse or wiring can cause the same symptoms, so diagnose the cause first. If the resistor is confirmed as the culprit, this resistor and its included pigtail replace the original assembly.
Interchange: RU-566
RU566 · 4P1629 · RU1259 · 204013 · 20648 · 2BMR0203 · 2308216451 · JA1751
This part cross-references / interchanges with the following part numbers:
4P1629, RU1259, 204013, 20648, 2BMR0203, 2308216451, RU-566, JA1751
Frequently Asked Questions
What does a blower motor resistor do?
It is part of the circuit that controls blower fan speed. It lets the HVAC fan run at the different speed settings selected on the climate controls.
What comes with the Dorman blower motor resistor kit?
Each kit includes a blower motor resistor and a harness pigtail. The pigtail is essential for most repairs.
Which Mercedes-Benz models does this resistor kit fit?
It fits many Mercedes-Benz models, including the 2008-2009 Mercedes-Benz E300, 2003-2009 Mercedes-Benz E320 and 2006-2009 Mercedes-Benz E350. Check the "Vehicles it fits" section for the full list.
What are signs the blower motor resistor may need replacing?
Warning signs include a blower that works on some speeds but not others, runs only on high, or blows no air. Diagnose first, because a motor, switch, fuse or wiring fault can cause the same symptoms.
Is this a direct replacement for the original resistor?
Yes. It is designed to directly replace the original equipment resistor on the listed applications. Follow the vehicle's service information for installation and for connecting the harness pigtail.
