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3. A/C, cars with diesel engines: Diagnostics

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

In the event of a fault in any of the aforementioned sensors in the systems concerned, the A/C compressor will not work. The function chain clearly shows the importance of obtaining diagnostic trouble code readouts from all systems because several systems are involved in any given function.

If there are no diagnostic codes with the symptom description "A/C not cooling", all the input values that can block the function must be reviewed methodically using the read values command on the diagnostic tool. The compressor relay is activated in the engine management system. Then perform fault diagnosis on the system that "owns" the sensor or actuator that is faulty.

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