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Gilly has nailed it. Those are the two possibilities.
The blower has three wires -- hot, ground, and control. If the control wire is disconnected, the control lead of the big transistor on the porcupine heatsink will float high enough to partially turn on. That would run the blower in low speed all the time, as the blower gets power whenever the ignition is on, even if the PBU is off.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
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Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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