Bypass Control Valve
WARNING: This page is about a different car, the 2001 Saab 9-5 and 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Disconnect bypass control valve connector. Measure resistance between bypass control valve connector terminals. Resistance should be 35-45 ohms at 68°F (20°C). If resistance is not as specified, replace bypass control valve.