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 notice
The following technical information and tips for practical use have been set up by HELLA in order to offer professional support to automotive workshops in their daily work. The information available here on this website is only to be used by appropriately trained specialist staff.
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