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 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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