The vehicles mentioned above may experience a failure of the air-conditioning system due to a defective coolant thermostat.
When the motor is switched off and is still warm from operation, the coolant temperature increases (to 130°C).
As a result, the thermostat opens "up to the limit stop" and can get stuck in this position. The on-board electronics system interprets this as an error and switches off the air-conditioning system. The error code P0128 (coolant thermostat) is then stored in the error memory.
In order to remedy this situation, the thermostat (see figure) should be replaced and the error memory cleared.
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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