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Hello Mark,
climate control problem: The climate control system needs 2 temperature signals. One is the sensor outside the car in the front right (LHD) of the bumper. The other is the interior temperature sensor. If one of these sensors isn't connected correctly or doesn't work correctly, the climate system doesn't work correctly.
As far as i know the climate system isn't monitored by PIWIS in a 97 car. But you can check the complete sensor system if you have a digital multimeter system. For details see Porsche workshop manual - Heating diagnosis.
Regards, Markus
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