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Great report on your cross country trip. We are planning one this year. We own a 2016 ACE 29.3 which had same high pitch whistle. Ours was the grill. Notified our dealer which in turn notified Thor. They sent us a wire mesh that I installed on backside of grill. Easy fix. Also you may check your furnace outside vent door. The louvers on some were stamped upside down which lets water run in directly on furnace circuit board.
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