In the above vehicles, an incorrect quantity of refrigerant may lead to noise generation when the air conditioning system is on.
Humming and droning noises may be caused by insufficient/excess refrigerant in the air conditioning system.
If the steering wheel judders while driving at an engine speed of 900-1100 rpm (AC on), this is often also an indicator that the refrigerant quantity is incorrect.
In order to remedy this problem, the refrigerant should be sucked out and the system refilled with the quantity of refrigerant recommended by the manufacturer.
This information may also apply to other model years and engines.
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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