Vauxhall Astra J - Air-conditioning system not working | HELLA

The vehicles mentioned above may experience a failure of the air-conditioning system. A defective coolant thermostat must be considered as a possible cause for such failures.

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." It can get stuck in this position. The on-board electronics system interprets this as a faulty temperature setting and switches off the air-conditioning system.

The error code P0128 (coolant thermostat) is then stored in the error memory.