Get every fan speed working again with the Standard Ignition HVAC Blower Motor Resistor RU-404. This front HVAC blower motor resistor drops in as a direct-fit replacement for a wide range of Ford, Mazda and Mercury trucks and SUVs, including the 1995-2001 Ford Explorer, 2001-2003 Ford Explorer Sport, 2001-2005 Ford Explorer Sport Trac, 1996-2001 Ford F-100 Ranger and 1995-2013 Ford Ranger — see the Buyer's Guide tab for the full list.
The blower motor resistor sits in the heating and air-conditioning circuit and controls the current sent to the blower motor, setting the lower and mid-range fan speeds. When it fails, the blower often works only on the highest setting or loses one or more speeds. If a failed resistor is the cause, this unit replaces it — diagnose the cause first, since other components can produce the same signs.
- Regulates fan speed: varies resistance in the blower circuit to provide the selectable lower and mid-range speeds.
- Front HVAC application: cataloged for the front HVAC system on the listed vehicles.
- Direct-fit replacement: designed to install in place of the original resistor for the listed applications.
Fitment: 1995-2001 Ford Explorer, 2001-2003 Ford Explorer Sport, 2001-2005 Ford Explorer Sport Trac, 1996-2001 Ford F-100 Ranger, 1995-2013 Ford Ranger, 1995-1997 and 2001-2010 Mazda B2300, 1998-2001 Mazda B2500, 1995-2008 Mazda B3000, 1995-2010 Mazda B4000, and 1997-2001 Mercury Mountaineer (all engines).
Manufacturer part number RU-404 (also RU404).
Frequently Asked Questions
What does the HVAC blower motor resistor do?
It sits in the blower circuit and varies resistance to set the lower and mid-range fan speeds sent to the blower motor.
What are the signs this resistor may need replacing?
The blower may work only on high or lose one or more of its lower speeds. Diagnose the cause before replacing, since other components can produce the same signs.
Will the RU-404 fit my vehicle?
It's cataloged for many Ford, Mazda and Mercury models, including the 1995-2013 Ford Ranger and 1995-2001 Ford Explorer. Check the Buyer's Guide tab to confirm your exact vehicle.
Is this a front or rear HVAC part?
It is cataloged for the front HVAC system on the listed applications.
How many are needed per vehicle?
The listed applications use one per vehicle.
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