I've tried putting the system in to test mode by setting to 21, windscreen and auto, then pressing temp up and a/c together,then releasing and immediately pressing temp down, as stated on a few other articles I found, but doesn't work, just drops temp display 1/2 a degree on the last button press so not sure if there is a different combination of keys i need, it's a 2002 2.0 tdci ghia x.
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