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The clicking you hear may be arcing from the blower motor brushes. My 300sd was doing exactly as you describe. I pulled the blower motor and found a badly worn comm and brushes in the motor. All I did was strech out the coil springs that push the brushes aganst the comm. Still running quietly 6 months later!
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Mike
1983 Mercedes-Benz 300SD 270K
1960 Ford F250 62K
1990 Mazda Miata 156k
The thing is Bob, it's not that I'm lazy, it's that I just don't care.
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