If loud whistling noises from the engine compartment are detected when the air-conditioning system is turned on, this could be related to a defective belt tensioner bearing in the alternator. In this case, the old bearing (18 spokes) should be checked and optionally replaced by a modified bearing with 20 spokes (Fiat 46557129). After replacement, please check that the belt tensioner bearing and the compressor belts match. If their centering does not align, this must be optimized.
The centering can be optimized by removing the bearing and shimming with a maximum of two 0.5 mm washers (Fiat 13579771) on the compressor bracket.
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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