Where is the blower fusible link situated? Blower flips between setting 2 and 4 on 1994 Mercedes-Benz C280

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The climate setting (digital is good) The volume doesn't change between setting 3 and 4 and it clicks off and on!
I sense it could be the fusible link or fan resistor.
(1) Answer
(3) Comments
Thanks very much for your assistance.
I shall do as you recommend and let you know the outcome.
Much appreciated,
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