In the event of a failure of the passenger compartment fan, the cause may be a defect in the electronic blower controller.
After removing the blower controller, taking a look at the circuit board can often help determine the cause of the fan failure. If the board is burned out (see image), the controller has to be replaced. In addition, the connecting cable and fuse should be checked. Furthermore, the fan should be checked to ensure it can move easily.
Note:
Due to the ground circuit, the blower controller no longer runs without a specified level in the event of a defect.
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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