2000 BMW 323i E46 A/C problem?

I'm having trouble with my BMW's A/C fan speed. Apparently there's only 2 speeds for it now, "OFF" or "HIGH". Right off the bat when I start the car the fan speed is at low and I can control it like normal, after a few minutes of driving the A/C starts blowing at the highest speed... show more I'm having trouble with my BMW's A/C fan speed. Apparently there's only 2 speeds for it now, "OFF" or "HIGH". Right off the bat when I start the car the fan speed is at low and I can control it like normal, after a few minutes of driving the A/C starts blowing at the highest speed even if it's still set at "LOW" and I am unable to control the blower force again. What's going on??
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