I have a 2020 four winds 28A that does the same thing, except mine only occurs at about 2100 RPM. Doesn't matter what gear or speed, at 2100 RPM, I hear a squeak squeak squeak noise coming from the front drivers side. I would love to know what it is. I haven't tried mine with the AC off yet. It sounds like it could possibly be a squeaky pulley or belt. Any chance you could get a video clip of the sound?
Pete
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