Standard Ignition RU-428 blower motor resistor for the 1998-2005 Volkswagen Passat and other vehicles controls the blower motor's speed settings. This HVAC blower motor resistor is designed for Audi and Volkswagen applications.
- Copper alloy conductors with minimal resistive losses for consistent performance
- Designed to connect to the vehicle's HVAC system
- Intended to restore variable speed control of the A/C and heater blower motor
- Extensive testing for durability and longevity
Quick facts
- Part: Standard Ignition RU-428 blower motor resistor
- Also called: HVAC blower motor resistor
- Fits: 1998-2005 Volkswagen Passat and other vehicles
- Condition: New
A blower that runs on only some speeds, or not at all, can mean this resistor is worn, though a failing blower motor or a blown fuse can produce the same signs, so pin down which one it is before you replace anything.
Fits
The vehicles it fits include the 1998-2005 Volkswagen Passat, the 1997-2002 Audi A4 and the 1997-2002 Audi A4 Quattro. If your car is not named here, look up its year and model in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 1
- Voltage: 12 V
- Number of speeds: 3-5 speed
- Harness length: 3 in (11.4 cm)
- Terminals: 8 blade terminals, male and female
- Connector cavities: 2
- Wires: 2
Build and materials
- Connector: rectangular, female
- Attachment method: screw
- Condition: New
- Country of origin: Germany
In the box
One blower motor resistor with its wiring harness; the vehicle takes one. Hardware and a mounting bracket are not included, so plan on new fasteners.
Interchange: 3B0907521 · 8D1907521 · 8D190752197 · RU1121 · JA1686 · BR331
This part cross-references / interchanges with the following part numbers:
3B0907521, 8D1907521, 8D190752197, RU1121, JA1686, BR331, RU-428
Frequently Asked Questions
I drive a 1998-2005 Volkswagen Passat; is this the right Passat blower motor resistor?
Yes. Standard Ignition RU-428 fits the 1998-2005 Volkswagen Passat, and the "Vehicles it fits" section lets you look up other years and models.
Will this blower motor resistor for the 1997-2002 Audi A4 also fit the 1997-2002 Audi A4 Quattro?
Yes. Standard Ignition RU-428 fits both the 1997-2002 Audi A4 and the 1997-2002 Audi A4 Quattro, one per vehicle.
Does the RU-428 come with its wiring harness and mounting screws?
It comes with a 3 in (11.4 cm) wiring harness. Mounting hardware and a mounting bracket are not included.
Is the RU-428 a 12-volt resistor for 3-5 speed blowers?
Yes. This blower motor resistor is a 12 V part for 3-5 speed blowers, with 8 blade terminals and a rectangular female connector.
Does the RU-428 replace number 3B0907521?
Yes. Standard Ignition RU-428 replaces 3B0907521, along with 8D1907521 and RU1121; the Interchange line lists the remaining numbers.
