With the above vehicles noise may be heard from the engine compartment when idling. The problem however only occurs when the air-conditioning system is switched off and is thus seldom attributed to the air-conditioning system.
A possible cause is a metal circlip, which is fitted to the front of the compressor pulley. When the vehicle is idling with the compressor switched off, the circlip can cause vibrations, which are transmitted via the compressor to the engine block and are perceived as annoying noise.
To rectify the problem, the circlip of the compressor coupling has been modified. With replacement
proceed as follows:
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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