I hear a slight hum when running on lower settings. The only reason I can't hear it at higher settings is because the airflow noise drowns out the howl. I have very good hearing; I think half the people who buy this won't hear the sound. It was enough to fix a jeep I was selling but knowing the kind of noise it makes I would buy an OEM for my car. Funny note: I bought an 07 Saturn Aura XR and its cabin fan is making the same noise. I don't know if it's OEM, of course, but I think so.
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