Regain control of your fan speeds with the Standard Ignition HVAC Blower Motor Resistor RU-333, a direct-fit replacement for the 1995-1998 Mazda Protege. This resistor sits in the blower circuit and sets the current the motor receives, giving you the range of low and medium fan speeds between off and high. If a failed resistor is why your Protege's blower only works on one setting — or not at all — this replaces it.
- Premium copper connectors: Standard Ignition uses premium copper electrical connectors for more precise resistance values, supporting consistent resistor performance and a longer part life.
- Variable-speed control: Restores A/C and heater blower motor variable speed control, helping to optimize HVAC output and passenger comfort.
- Application-matched fit: A research-and-design process aimed at seamless integration with the vehicle's HVAC system, and it's specifically designed for Mazda applications.
- Tested performance: Undergoes extensive testing at the manufacturer's facility to confirm correct performance across conditions.
Signs the original resistor may need replacing include a blower that runs only on high, missing lower speeds, or no airflow at all — diagnose the cause before replacing.
Interchange: RU1021 · JA1157 · BR231 · BC1M61B15 · BC5E61B15
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the blower motor resistor do?
It sets the current sent to the blower motor, providing the different resistance levels that give you low and medium fan speeds between off and high.
Will the RU-333 fit my vehicle?
It's a direct-fit replacement for the 1995-1998 Mazda Protege. Check the Buyer's Guide tab to confirm it matches your exact vehicle.
Why does my blower only work on the highest setting?
That's a common sign of a failed resistor, since high often bypasses it. If a bad resistor is the cause, the RU-333 replaces it; confirm the diagnosis first.
What connectors does this resistor use?
Standard Ignition uses premium copper electrical connectors for more precise resistance values, which supports steady performance and longer part life.
Is this resistor tested before sale?
Yes. It undergoes extensive testing at the manufacturer's facility to confirm correct performance across conditions.
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