The blower motor resistor gives your heater and A/C fan switch its lower speed settings, and the Standard Ignition Blower Motor Resistor RU-485 is built to take on that job. It is a direct-fit replacement for many vehicles, among them the 1985-1990 Dodge D150, 1985-1990 Dodge D250 and 1985-1990 Dodge D350. See the "Vehicles it fits" section for the full list and engine details.
The resistor sets those lower speeds by controlling how much current reaches the blower motor. If a failed resistor is why your fan runs only on high or skips speeds, RU-485 is designed to bring back variable speed control of the heater and A/C blower, helping HVAC performance and passenger comfort.
Signs this part may need replacing: The blower works only on its highest setting, one or more fan speeds are missing, or the fan does not respond to the speed switch. Diagnose the cause before replacing, since a switch, wiring or the motor can cause similar symptoms.
Interchange: RU1178 · 4261050 · 56003528 · BMRA238 · BR388
This part cross-references / interchanges with the following part numbers:
What does an HVAC blower motor resistor do?
It limits the current reaching the blower motor to create the fan's lower speeds, so the switch can select different speeds for heating and A/C.
What are signs this part may need replacing?
Common signs include a blower that runs only on high or skips one or more speeds. Diagnose first, since a faulty switch, wiring or the motor itself can cause similar symptoms.
Which vehicles does RU-485 fit?
It fits many vehicles, among them the 1985-1990 Dodge D150, 1985-1990 Dodge D250 and 1985-1990 Dodge D350. See the "Vehicles it fits" section for the full list and engine details.
What kind of electrical connectors does it use?
It uses premium copper electrical connectors for more precise resistance values, which is designed to improve resistor performance and give a longer part life.
Which part numbers does RU-485 interchange with?
It cross-references RU1178, 4261050, 56003528, BMRA238 and BR388.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
