Well I never owned a w201 but do know lots about a w124 of the same vintage. Both the aux fans in addition to being controlled by the kilma and the hvac fan are also controlled by the climate control unit ccu. A connector for the hvac fan is on the firewall beside the brake booster, disconnecting that will stop the fan if it exists on the 201. Another ccu maybe required. Hopefully that helps?

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92 e300d2.5t
01 e320
05 cdi
85 chev c10