Help your HVAC fan run at the speed you select with the Standard Ignition Blower Motor Resistor RU-404, a front-position resistor that controls how fast the blower motor spins. It is a direct-fit replacement for many listed models from Ford, Mazda and Mercury, among them the 1995-2001 Ford Explorer, 1995-2013 Ford Ranger and 2001-2010 Mazda B2300.
The blower motor resistor sets the fan's speed steps by changing the current that reaches the blower motor. The lower settings depend on it, so a worn or failed resistor can leave the fan stuck on one speed or unable to run at some settings. If the resistor is the cause of that problem, the RU-404 replaces it.
- Position: front, per the catalog listing.
- Quantity: the listed applications use one resistor per vehicle.
- Engines: listed for all engines on its applications.
- Brand: Standard Ignition, part number RU-404.
If you are shopping for a 1995-2001 Ford Explorer blower motor resistor, or for any of the other listed models, check the Buyer's Guide tab for the full list of years and vehicles. Other faults can cause the same fan-speed symptoms, so diagnose the cause before you replace the resistor. Follow the vehicle service information for its location and the installation steps.
