Just so we are on the same page, can you get a picture of the whistle so that I am sure we are talking about the same thing? Or just confirm that the picture I attached is what you are talking about? Does it go in the tailpipe?
If this is it, then this has nothing to do with the thermostat and you just have another issue that you need to correct.
Image (Click to make bigger)
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Wednesday, November 27th, 2019 AT 4:38 PM