According to this article from, the seventh step to test drive a used car is to turn the radio off.

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  1. 7. Turn the radio off.

    Unless you're evaluating the sound system, switch it off. Periodically turn off the air-conditioner or heater fan, but leave the windows up. This is so you can hear unusual noises. Though it's difficult even for professionals, attempt to separate normal noises from those caused by wind, tires and car problems. If you hear a disconcerting noise, try to isolate it by changing speeds or switching pavement.