When the fan speeds quit, the Standard Ignition Blower Motor Resistor RU-281 is designed to help bring variable-speed control back to the A/C and heater blower motor. It is a direct-fit replacement for the 1986-1989 Mazda RX-7. See the Buyer's Guide tab for engine details.
The blower motor resistor sets the voltage sent to the blower motor at each fan setting, which is how the blower runs at its lower speeds. When it fails, the fan settings you rely on for heating, cooling, and defrosting can stop working.
- Copper electrical connectors: Standard Ignition uses premium copper connectors for more precise resistance values, designed to improve resistor performance and provide a longer part life.
- HVAC integration: Standard Ignition's research and design process is aimed at seamless integration with the vehicle's HVAC system.
- Variable speed control: Helps restore A/C and heater blower motor variable-speed control, supporting HVAC performance and passenger comfort.
- Built for Mazda, tested in-house: Designed specifically for Mazda applications and put through extensive testing at Standard Ignition's facility to verify correct performance in all conditions.
Signs this HVAC blower motor resistor may need replacing include a blower that runs only on its highest setting, one or more fan speeds that no longer work, or a blower that won't run at all. A faulty blower motor, switch, or wiring can cause similar symptoms, so diagnose the cause first; if the resistor is at fault, RU-281 replaces it.
Interchange: RU981 · JA1163 · BR191 · FB0161B15
This part cross-references / interchanges with the following part numbers:
RU981, JA1163, BR191, FB0161B15, RU-281
