The vehicles mentioned above may experience noise from the compressor following a cold start of the engine.
This problem is especially common at low temperatures. In such cases, the noise is not necessarily an indication of a defective compressor.
These vehicles are generally fitted with vane compressors. Low temperatures can cause liquid refrigerant to get into the compressor, resulting in a knocking noise shortly after the engine has been started.
Once the motor has been running for a short time, gaseous refrigerant is sucked in again and the noise goes away.
This is a result of the design and weather conditions, not a technical defect.
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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