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Check Cabin Fan Motor Operation

Model: Mercedes Sl MK 5, R129 - Years 1989-2001
Part: Radiator

If the cabin fan does not activate at any speed when turned on, it may be a fault in the fan motor related to brush wear or damage to the motor windings; this motor is located outside the cabin, directly at the center of the windshield: to access it, remove the plastic covers under the windshield by taking off the various snap fasteners; once you reach the motor, disassemble the air ducts and remove it along with the fans, inspect the condition of the brushes, and try powering it directly; if the motor operates, then the issue is likely with the speed regulator: ensure that voltage is reaching the motor's power terminals.

Updated on 16 February 2026 by ScegliAuto

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