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Hi Timmy, my name is***** of these items require a reset. If the blower motor will not function I suspect the blower motor is seized. If the instrument cluster goes out I suspect the cluster will need to be replaced. Both are very common failures on the C class. You will need to get the car to a Mercedes specialist to test the power and ground to both items. If the power and ground is good they will need to be replaced.
Let me know if you have any questions.
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