Standard Motor Products RU229 HVAC Blower Motor Resistor

The Standard Motor Products RU229 is a direct-fit replacement HVAC blower motor resistor engineered to restore proper fan speed control to your vehicle's heating and air conditioning system. When a blower motor resistor fails, the fan may only operate on a single speed or stop working altogether — this replacement unit gets your climate control system back to full functionality.

How It Works:

The blower motor resistor controls the electrical current flowing from the fan switch to the blower motor, enabling the driver to select multiple fan speed settings. The resistor reduces or steps down voltage to the blower motor depending on the speed selected, allowing for low, medium, and high airflow settings.

Key Features:

• Direct-fit replacement — engineered to match OEM specifications for proper fit and function
• Restores all blower fan speed settings, including low, medium, and high
• 100% new construction — no remanufactured components
• Designed for dependable, maintenance-free operation
• Manufactured by Standard Motor Products, a trusted name in automotive electrical components since 1919

Standard Motor Products (SMP) is a leading manufacturer and distributor of automotive replacement parts, specializing in engine management and temperature control components. The RU229 is built to meet or exceed original equipment standards, providing a reliable, long-lasting repair solution.