Should the vehicles mentioned above experience a loss of heating and/or air-conditioning power, water entry into the wiring harness may be the cause.
Due to defective coolant control valves (heating, transmission), coolant can leak and enter the connectors and wiring. This results in electric defects and corrosion. Other defects will frequently occur throughout:
For eliminating the problem, check all coolant valves with their plugs and electric lines and replace where necessary.
The following vehicle models can be affected:
Model: year:
A8
2010 - 2013
Q7
2011 - 2013
A5 convertible
2012 - 2014
TT
2012 - 2014
A4
2012 - 2014
Q5
2012 - 2014
A5
2012 - 2013
A6/A7
2012 - 2013
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.
The reprinting, distribution, reproduction, exploitation in any form and 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, figures and descriptions are for explanation and presentation of the document text and cannot be used as a basis for installation or design. All rights reserved.
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