OE Quality
60-Day Returns

Standard Ignition RU-56 HVAC Blower Motor Resistor - Front
Reliable HVAC Blower Motor Resistor for Chevrolet and GMC Vehicles
The Standard Ignition RU-56 HVAC blower motor resistor is designed to restore proper blower motor speed control in select Chevrolet and GMC models. Engineered for durability and precise fitment, this resistor ensures consistent HVAC performance for your vehicle's heating and cooling system.
- Compatible with Chevrolet G10, G20, G30, P30, and GMC P3500 models
- Supports 3-5 speed blower motor operation
- Rectangular connector shape with male blade terminals (4 terminals)
- Attachment method: screw mount for secure installation
- No wiring harness or mounting brackets included
Product Details and Specifications
The RU-56 blower motor resistor from Standard Ignition features a screw attachment method, allowing for a secure and stable installation in your vehicle's HVAC system. It includes four male blade terminals arranged in a rectangular connector shape, designed to interface directly with your vehicle's existing wiring harness (not included). This resistor supports blower motors with 3 to 5 speed settings, providing reliable control over your heating and cooling fan speeds. The absence of a wiring harness or mounting brackets means this part is intended as a direct replacement for the original resistor in Chevrolet G10, G20, G30, P30, and GMC P3500 models.
Common Applications and Issues Addressed
- Restores proper blower motor speed control in Chevrolet and GMC vans and trucks
- Resolves blower motor stuck on one speed or not working at all
- Fixes intermittent blower motor operation or inconsistent fan speeds
- Eliminates overheating or burning smell caused by faulty resistor
- Addresses blower motor resistor failure symptoms in G10, G20, G30, P30, and P3500 HVAC systems
Installation Notes and Tips
Installation of the Standard Ignition RU-56 blower motor resistor requires removal of the old resistor from the HVAC housing, typically secured by screws. Ensure the vehicle's ignition is off and the battery is disconnected before beginning installation. The rectangular connector with male blade terminals should be carefully aligned with the vehicle's wiring harness connector. Since no wiring harness or mounting brackets are included, reuse the original hardware and connectors for proper fitment. Verify blower motor operation after installation to confirm correct function.
Quality Assurance and Warranty
Standard Ignition parts are manufactured to meet or exceed OEM specifications, ensuring reliable performance and fitment. The RU-56 blower motor resistor undergoes quality control testing to maintain consistent electrical resistance and durability. While specific warranty details may vary, Standard Ignition typically offers a limited warranty covering defects in materials and workmanship. Consult product documentation or your parts provider for exact warranty terms.
| Brand | Standard Ignition |
| Part Number | RU-56 |
| Attachment Method | Screw |
| Connector Gender | No Connector |
| Connector Shape | Rectangular |
| Hardware Included | No |
| Harness Length - cm | No wire |
| Harness Length - inches | No wire |
| Mounting Bracket(s) Included | No |
| Number Of Speeds | 3-5 Speed |
| Terminal Gender | Male |
| Terminal Type | Blade |
| Wiring Harness Included | No |
This part fits 49 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1996 | GMC | G3500 | Front | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1996 | GMC | P3500 | 4.3L | V6 | Front | w/ AC; Main Unit |
| 1996 | GMC | P3500 | 5.7L | V8 | Front | w/ AC; Main Unit |
| 1996 | GMC | P3500 | 6.5L | V8 | Front | w/ AC; Main Unit |
| 1996 | GMC | P3500 | 7.4L | V8 | Front | w/ AC; Main Unit |
| 1995 | Chevrolet | G10 | Front | |||
| 1995 | Chevrolet | G20 | Front | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1995 | Chevrolet | G30 | Front | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1995 | GMC | G1500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1995 | GMC | G2500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1995 | GMC | G3500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1995 | GMC | P3500 | 4.3L | V6 | Front | w/ AC; Main Unit |
| 1995 | GMC | P3500 | 5.7L | V8 | Front | w/ AC; Main Unit |
| 1995 | GMC | P3500 | 6.5L | V8 | Front | w/ AC; Main Unit |
| 1995 | GMC | P3500 | 7.4L | V8 | Front | w/ AC; Main Unit |
| 1994 | Chevrolet | G10 | N/A | |||
| 1994 | Chevrolet | G20 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1994 | Chevrolet | G30 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1994 | Chevrolet | P30 | 4.3L | V6 | Front | w/ AC; Main Unit |
| 1994 | Chevrolet | P30 | 5.7L | V8 | Front | w/ AC; Main Unit |
| 1994 | Chevrolet | P30 | 6.5L | V8 | Front | w/ AC; Main Unit |
| 1994 | Chevrolet | P30 | 7.4L | V8 | Front | w/ AC; Main Unit |
| 1994 | GMC | G1500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1994 | GMC | G2500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1994 | GMC | G3500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1994 | GMC | P3500 | 4.3L | V6 | Front | w/ AC; Main Unit |
| 1994 | GMC | P3500 | 5.7L | V8 | Front | w/ AC; Main Unit |
| 1994 | GMC | P3500 | 6.5L | V8 | Front | w/ AC; Main Unit |
| 1994 | GMC | P3500 | 7.4L | V8 | Front | w/ AC; Main Unit |
| 1993 | Chevrolet | G10 | N/A | |||
| 1993 | Chevrolet | G20 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1993 | Chevrolet | G30 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1993 | Chevrolet | P30 | 4.3L | V6 | Front | w/ AC; Main Unit |
| 1993 | Chevrolet | P30 | 5.7L | V8 | Front | w/ AC; Main Unit |
| 1993 | Chevrolet | P30 | 6.2L | V8 | Front | w/ AC; Main Unit |
| 1993 | Chevrolet | P30 | 7.4L | V8 | Front | w/ AC; Main Unit |
| 1993 | GMC | G1500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1993 | GMC | G2500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1993 | GMC | G3500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1993 | GMC | P3500 | 4.3L | V6 | Front | w/ AC; Main Unit |
| 1993 | GMC | P3500 | 5.7L | V8 | Front | w/ AC; Main Unit |
| 1993 | GMC | P3500 | 6.2L | V8 | Front | w/ AC; Main Unit |
| 1993 | GMC | P3500 | 7.4L | V8 | Front | w/ AC; Main Unit |
| 1992 | Chevrolet | G10 | N/A | |||
| 1992 | Chevrolet | G20 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1992 | Chevrolet | G30 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1992 | GMC | G1500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1992 | GMC | G2500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator | ||
| 1992 | GMC | G3500 | N/A | HVAC Blower Motor Resistor Harness with AC - Voltage Regulator |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.