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 TechnicianThis 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.
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.
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