My daughters 1998 E320 clearly has a bad blower regulator. Many sources sell the "updated" regulators, 210 821 15 51 for good prices, but many also state that a new expensive blower is necessary and a new mounting plate as well.

Is it really necessary to replace a working DC blower when you update the regulator or is it just a matter of customizing the wiring harness and mounting it carefully?

If so, is there a way of working around this with a different regulator?
Many thanks.

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