Get every fan speed back on the rear HVAC system with the Standard Ignition HVAC Blower Motor Resistor RU-447 (also written RU447). This rear blower motor resistor steps the current feeding the blower motor so the fan runs at each selectable speed instead of only high or off. It drops in as a direct-fit replacement for the 1997-2002 Ford Expedition, 1995-2001 Ford Explorer, 2001-2003 Ford Explorer Sport, 2002-2005 Ford Explorer Sport Trac, and 2002-2003 Lincoln Blackwood — see the Buyer's Guide tab for engine details.
- Premium copper connectors: used to deliver more precise resistance values, which improves resistor performance and supports a longer part life.
- Seamless HVAC integration: the research and design process is aimed at fitting cleanly into the vehicle's HVAC system.
- Variable-speed control: designed to restore A/C and heater blower motor variable speed control, helping optimize HVAC performance and passenger comfort.
- Ford-specific & tested: specifically designed for Ford applications and put through extensive testing to confirm correct performance across conditions.
If a failed resistor is the cause of your missing fan speeds, this replaces it. Diagnose the blower circuit before installing.
Interchange: RU1140 · JA1705 · BR350 · 4L1Z19A706AA · F5TZ19A706A
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this blower motor resistor do?
It provides resistance steps to the blower motor circuit so the rear HVAC fan can run at its lower selectable speeds instead of only high or off.
Which vehicles does the RU-447 fit?
It's a direct-fit for the 1997-2002 Ford Expedition, 1995-2001 Ford Explorer, 2001-2003 Explorer Sport, 2002-2005 Explorer Sport Trac, and 2002-2003 Lincoln Blackwood. See the Buyer's Guide tab.
Is this a front or rear resistor?
This is the rear HVAC blower motor resistor for the listed Ford and Lincoln applications.
Why did my blower only work on high?
A failed resistor often leaves only the high setting working. If the resistor is the cause, this replaces it, but diagnose the blower circuit first as other parts can cause it.
What numbers does this part interchange with?
It replaces RU1140, JA1705, BR350, 4L1Z19A706AA, and F5TZ19A706A.
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