The fan blower motor resistor is typically housed within the vehicle’s HVAC (heating, ventilation, and air conditioning) assembly, near the blower motor itself. In most cars, it sits on or near the side of the blower housing, often behind the glove box or under the dash on the passenger side; exact placement varies by make, model, and year. Note that in newer vehicles, some systems use an electronic blower motor control module instead of a traditional resistor pack, which may be integrated into the blower assembly or HVAC module.
This article explains the common locations you’re likely to encounter, how to identify the resistor or its module, and what to expect during inspection or replacement.
Common locations in modern vehicles
The following are typical placements you may encounter:
- Inside the HVAC housing, directly attached to the blower motor or its mounting area—the most common arrangement.
- Behind the glove box on the passenger side, where the HVAC unit is accessible for service.
- Under the dash near the passenger footwell or wiring harnesses, sometimes requiring panel removal for access.
- In some designs, the resistor pack is integrated with the blower motor or HVAC module, rather than as a separate block.
When searching for it, start with the passenger-side lower dash area or behind the glove box, and consult your vehicle’s service manual for the exact location and procedure for your model.
Signs of a failing blower motor resistor
If the resistor is failing, you may notice one or more of the following symptoms:
- Blower fan only works on certain speeds (commonly high but not low/middle speeds).
- Intermittent operation or abrupt changes when selecting different speed settings.
- No airflow on one or more low-speed settings while other speeds function normally.
- Unusual noises, burning smell, or heat coming from the HVAC area when the blower is in use.
Diagnosing the issue typically involves checking fuses and wiring first, then inspecting the resistor pack or blower control module. If accessible and affordable, replacing the resistor (or the control module, if applicable) is often straightforward, though access may require removing panels or the glove box. Always disconnect the battery before working on electrical HVAC components.
Summary
Across most vehicles, the blower motor resistor is located within the HVAC housing near the blower motor, with the glove box area being a common access point. Though the exact spot varies by make and model, locating the resistor pack or blower control module generally follows these patterns. Recognize common symptoms—loss of low speeds, intermittent operation, or burning smells—to guide inspection and replacement. For precise location and steps, refer to the specific service manual for your vehicle.