Dorman 984-422 HVAC Blower Motor Resistor

Overview of Dorman HVAC Blower Motor Resistor 984-422

The Dorman 984-422 HVAC blower motor resistor is designed for precise control of blower motor speeds in select BMW and Rolls-Royce vehicles. This component ensures reliable operation of the HVAC system by regulating current flow to the blower motor.

• Compatible with BMW 520i, 528i xDrive, 530i, and Rolls-Royce Ghost models
• Features 2 bolt holes for secure mounting
• Equipped with 2 rectangular female connectors and 2 male blade terminals
• Includes blower motor resistor and installation instructions
• No wiring harness or mounting hardware included

Technical Details and Attributes

The Dorman 984-422 blower motor resistor is engineered with two bolt holes to ensure a stable and secure fit within the HVAC system. It uses blade-type terminals, with a total of four terminals—two male and two female—facilitating proper electrical connections. The resistor has two rectangular female connectors designed to interface seamlessly with the vehicle's wiring harness. This part does not include a wiring harness or mounting hardware, so those components must be reused or sourced separately during installation.

Compatible Vehicles and Application

This blower motor resistor is compatible with specific BMW and Rolls-Royce models, including the BMW 520i, 528i xDrive, 530i, and the Rolls-Royce Ghost. It is intended for use in HVAC systems where precise blower motor speed control is required. The part number 984-422 should be referenced to ensure correct fitment and compatibility with these vehicles.

Common Issues Addressed by the Blower Motor Resistor

• Inconsistent blower motor speeds or blower stuck on one speed
• HVAC blower not operating at all speeds
• Intermittent blower motor function
• Overheating or electrical resistance failure in the blower circuit
• HVAC system blower motor resistor failure causing reduced airflow

Installation Notes and Tips

When installing the Dorman 984-422 blower motor resistor, ensure the vehicle’s ignition is off and the battery is disconnected to prevent electrical shock. Retain the original mounting hardware if possible, as this part does not include mounting bolts. Carefully disconnect the existing resistor’s connectors, noting the orientation of the blade terminals and rectangular female connectors. Follow the included instructions for proper installation and torque specifications. Verify all electrical connections are secure before reassembling the HVAC housing.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The 984-422 blower motor resistor undergoes quality control testing to ensure reliable performance in compatible BMW and Rolls-Royce models. This part includes installation instructions and is backed by Dorman’s limited warranty, which covers defects in material and workmanship under normal use.