On the above mentioned vehicles a blocked condensed water drain hose can cause a short circuit in the electrical booster heater.
The function of the electrical (PTC) booster heater in the heater unit can be significantly degraded by a blocked condensed water drain.
Due to the fact that the condensed water is not drained to the exterior, there is a risk of an electrical short circuit. In an extreme case there is a risk of a cable fire.
The problem has already been addressed by the vehicle manufacturer, the vehicles checked during a recall campaign and the drain hose/drain valve renewed.
It must be assumed, that for a variety of reasons not all vehicles have been checked and/or repaired.
Please take this information into account, particularly in relation to complaints about poor heating performance.
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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