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Thank you for verifying what I thought I should do anyway. But I'm not even sure if over heating horn works either. Where does the water come out so that I may verify if it's working or not?Back in the day folks knew that you had to install a new impeller every 5 years or so.----Therefor no need for a tell tale.-----Install a new impeller ( easy to do ) in my opinion.----Test your overheat warning horn and go fishing.