Keep your blower fan cycling through all of its speed settings with the Standard Ignition HVAC Blower Motor Resistor RU-55. This resistor sits in the blower motor circuit and adds resistance to drop the voltage reaching the fan, producing the lower and medium speed settings; on the highest setting the motor generally runs at full voltage. It installs as a direct-fit replacement for the listed applications, including the 1986-1993 Buick Century, 1987-1996 Chevrolet Beretta and 1987-1998 Pontiac Grand Am, plus many more General Motors models (see the Buyer's Guide tab for the full list).
- Controls fan speed: provides the resistance that steps the blower motor down to its low and mid settings.
- Direct-fit replacement: designed to install in place of the original resistor on the listed applications.
- Addresses a common failure: if a failed resistor is the cause, replacing it can bring back the affected fan speeds.
Signs this part may need replacing include a blower that runs only on high, or one or more speed settings that no longer work. Because those symptoms can have other causes, such as the blower motor, switch or wiring, diagnose the circuit before replacing.
Fits (all engines): 1986-1993 Buick Century · 1986-1989 Buick Skyhawk · 1986-1998 Buick Skylark · 1986-1987 Buick Somerset · 1986-1988 Cadillac Cimarron · 1987-1996 Chevrolet Beretta · 1987-1994 Chevrolet Cavalier · 1988-1990 Chevrolet Celebrity · 1987-1996 Chevrolet Corsica · 1986-1987 Oldsmobile Calais · 1988-1991 Oldsmobile Cutlass Calais · 1986-1993 Oldsmobile Cutlass Ciera · 1988-1993 Oldsmobile Cutlass Cruiser · 1987-1988 Oldsmobile Firenza · 1988-1991 Pontiac 6000 · 1987-1998 Pontiac Grand Am · 1987-1994 Pontiac Sunbird.
Manufacturer part number RU-55.
Frequently Asked Questions
What does the RU-55 blower motor resistor do?
It sits in the blower motor circuit and adds resistance to lower the voltage reaching the fan, producing the low and medium speed settings; on high the motor generally runs at full voltage.
What vehicles does it fit?
It's a direct-fit replacement for many 1986-1998 GM models, including the Buick Century and Skylark, Chevrolet Beretta, Corsica and Cavalier, and Pontiac Grand Am. See the Buyer's Guide tab for the full list.
What are the signs my blower motor resistor may need replacing?
Common signs are a blower that works only on high speed, or one or more fan speeds that no longer work. These symptoms can have other causes, so diagnose the circuit first.
Will replacing this fix my fan?
If a failed resistor is the cause, replacing it can restore the affected fan speeds. Because a blower motor, switch or wiring can cause similar issues, confirm the resistor is at fault before installing.
How many do I need?
The listed applications use one per vehicle.
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