The air-conditioning / heater system control units may occasionally fail in the above vehicles.
Inadequate ground connection can be the possible cause here. For remedying the situation, check ground supply of control unit multi-plug. It might be necessary to run and connect a new ground cable from the control unit to the ground point of the left front door's rocker panel.
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.
Not helpful at all
Very helpful