Keep your blower fan speeds working with the Standard Ignition HVAC Blower Motor Resistor RU-303 (also written RU303). This rear-position resistor drops in as a direct-fit replacement for the 1984-1988 Toyota 4Runner; see the Buyer's Guide tab for engine-level fitment. A blower motor resistor regulates the current sent to the HVAC blower motor so the fan can run at its different speed settings — if a failed resistor is the cause, the blower often works on only one speed (typically high) or drops certain speeds entirely.
- Precise resistance values: premium copper electrical connectors are used for more accurate resistance, which supports resistor performance and part life.
- Variable-speed control: manages the blower motor's variable speed operation for A/C and heater airflow, helping optimize HVAC performance and passenger comfort.
- Seamless integration: the research and design process targets a clean fit within the vehicle's HVAC system.
- Toyota-specific: designed for Toyota applications and put through extensive facility testing to confirm correct performance across conditions.
Interchange: RU1003 · JA1371 · BR213 · 8863589104 · 8863589106
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this blower motor resistor do?
It regulates the current sent to the HVAC blower motor, allowing the fan to run at its different speed settings for A/C and heater airflow.
What vehicle does the RU-303 fit?
It's a direct-fit replacement for the 1984-1988 Toyota 4Runner. Check the Buyer's Guide tab to confirm fitment for your vehicle.
Is this a front or rear resistor?
This is the rear-position HVAC blower motor resistor for the listed 4Runner applications.
What are signs this resistor may need replacing?
Common signs include the blower working on only one speed (often high) or certain fan speeds not functioning. Diagnose the cause before replacing.
What numbers does this part interchange with?
It cross-references RU1003, JA1371, BR213, 8863589104, and 8863589106.
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