Standard Ignition RU-404 HVAC Blower Motor Resistor - Front

Reliable HVAC Blower Motor Resistor for Ford, Mazda, and Mercury Vehicles

The Standard Ignition RU-404 HVAC blower motor resistor is designed to restore proper blower motor speed control in select Ford, Mazda, and Mercury models. Engineered for durability and precise fitment, this resistor ensures consistent HVAC performance for your vehicle's heating and cooling system.

• Bolt-on attachment method for secure installation
• Female rectangular connector with 4 cavities
• Supports 3-5 blower motor speeds
• Includes mounting bracket(s) for easy setup
• Compatible with Ford Ranger, Explorer, Mountaineer, Mazda B-series, and Mercury models

Product Details and Specifications

The RU-404 blower motor resistor from Standard Ignition features a bolt-on design that simplifies replacement without the need for additional hardware, as none is included. It has a female rectangular connector with four cavities and four male blade terminals, ensuring a reliable electrical connection. This resistor supports multiple blower motor speeds, ranging from three to five, accommodating various HVAC system configurations. The product does not include a wiring harness or wires, but it comes with mounting brackets to secure the resistor firmly in place.

Compatible Vehicles and Applications

This HVAC blower motor resistor is compatible with a range of Ford, Mazda, and Mercury vehicles, including the Ford Ranger, Explorer, Explorer Sport, Explorer Sport Trac, F-100 Ranger, Mountaineer, and Mazda B2300, B2500, B3000, and B4000 models. The RU-404 part number ensures you are selecting the correct resistor for these specific applications, maintaining proper blower motor function and HVAC system reliability.

Common Issues Addressed by the RU-404 Resistor

• Intermittent or non-functioning blower motor speeds
• Blower motor stuck on a single speed
• HVAC blower motor not responding to control settings
• Overheating or electrical resistance failure in blower motor circuit
• Reduced airflow or inconsistent cabin temperature control

Installation Notes and Tips

Installation of the Standard Ignition RU-404 blower motor resistor requires removal of the old resistor and securing the new unit using the included mounting brackets. Since the resistor uses a bolt-on attachment method, ensure bolts are tightened to manufacturer specifications. The connector is female and rectangular with four cavities, so verify proper alignment before securing. No wiring harness is included, so use the existing vehicle harness for connection. Always disconnect the vehicle battery before installation to prevent electrical shorts.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications, providing reliable performance and durability. The RU-404 blower motor resistor undergoes rigorous quality control to ensure consistent electrical resistance and fitment. While specific warranty details may vary, Standard Ignition typically offers a limited warranty covering defects in materials and workmanship. Refer to the product documentation for exact warranty terms.