Description
Product Overview
The Standard Motor Products Blower Motor Resistor (Model RU491) is engineered for durability and consistent performance in automotive and HVAC applications. Featuring a painted exterior that resists corrosion, this compact resistor measures 2.2 x 1.9 x 4.1 inches and weighs just 0.01 ounces, making it easy to handle and install. Designed to match OEM specifications, it ensures optimal airflow control and protects the blower motor from voltage spikes.
Usage
This resistor is ideal for repairing or upgrading blower motors in cars, trucks, and residential HVAC units. It fits seamlessly into standard blower assemblies, providing reliable operation in both hot and cold climates. Technicians and DIY enthusiasts alike will appreciate its straightforward installation process, which reduces downtime during service.

Why Choose Us
Standard Motor Products is a trusted name in automotive components, known for rigorous quality testing and adherence to industry standards. Each resistor undergoes thorough inspection to guarantee performance and longevity. Our commitment to precision manufacturing ensures that the RU491 delivers consistent results, minimizing the risk of motor failure.
Key Features
- Painted finish for superior corrosion resistance
- Compact dimensions for easy fit in tight engine bays
- Exact OEM specifications for reliable blower control
- Lightweight design reduces overall system weight
- Proven performance in automotive and HVAC applications
FAQ
What vehicles are compatible with the RU491 resistor?
The RU491 is compatible with most North American and Asian vehicle models that use a standard blower motor relay, as well as many residential HVAC systems.
Is any special tooling required for installation?
No special tools are needed; the resistor can be installed using standard screwdrivers and socket sets commonly found in automotive repair kits.
How does the painted coating benefit the resistor?
The painted coating protects the component from moisture, road salt, and other environmental factors, extending its service life.
Can this resistor be used as a direct replacement for OEM parts?
Yes, the RU491 matches OEM specifications, making it a direct, plug‑and‑play replacement for original blower motor resistors.
What is the warranty on this product?
Standard Motor Products offers a one‑year limited warranty covering defects in materials and workmanship.




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