The temp sensor will limit the rpm's that your engine's "computer" will allow to just over idle. The only sound that you would hear should come from a buzzer under the dash. It wouldn't make any different sounds from the engine though.
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OMC never had the temp fail safe idel control , just the buzzer warning sound or low oil warning back when those old v-8's were made. I'm not sure they ever have but I'm not an OMC guru.
jechols, go to the man I posted on cause the help you're getting here, isn't.