i too have had the "radom fan speed" be related to the control panel, rather than the blower resistor/transistor pack.
fan on X, would go at x, then slow or fast or the number it was set to, replacment blower resistor didnt do it, needed new control panel.
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940s - 2l / 92 < gone&missed s401.8 xs auto <gone >V50 2.4SE Geartronic aka "the new money pit"
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