AC/Heat fan randomly changes speed

[MakinDoForNow]

On trips have noticed fan running on slowest speed (1), it will randomly ramp up in speed. Setting does not show higher speed but air volume and noise is definitely greater. Normal? 2024 lariat, not hybrid.

The truck has a humidistat and air is continually moved at least through the floor vents. If the humidity approaches the dew point the air movement and temperature will be adjusted to prevent moisture condensing.

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