Blower Motor Resistor
The blower motor resistor controls the fan speed settings for your heating and AC. When it fails, you may lose some fan speeds or only have the highest setting working. Replacing the resistor restores full control over your cabin airflow.
Find a TechnicianCommon causes
- Burned out or overheated resistor from constant use
- Fan only works on the highest speed setting
- Some or all fan speeds stop working
- Corroded or damaged electrical connector at the resistor
- A failing blower motor drawing too much current
Frequently asked questions
Why does my fan only work on the highest setting?
This is a classic sign of a failed blower motor resistor. The resistor controls the lower fan speeds, so when it fails, only the high speed, which bypasses the resistor, keeps working.
Is replacing a blower motor resistor expensive?
It's usually one of the more affordable HVAC repairs since the part itself is inexpensive and accessible on most vehicles. A mechanic can confirm the exact cost based on your car's make and model.
How it works
Describe the issue
Tell us what's going on with your car. Our platform matches you with verified providers who handle this exact problem.
Connect with a provider
Browse verified mobile mechanics and auto service pros near you. Read real reviews and pick the best fit.
Get it fixed
Your provider comes to your location, diagnoses the issue on the spot, and gets you back on the road.