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
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