Ok, even for the manual climate control with only one temperature control, there are 2 doors and 2 actuators, one for left and one for right side. It is unlikely that either both doors or both actuators have failed at same time and more likely that it is the control unit.
The problem with verification is that a volvo (VIDAS) scan tool is needed to confirm that it is the control unit and not the actuators. To verify without this is a pain. The actuators can ONLY be accessed for testing with voltmeter by removing the entire dash in order to test them for signal. A scan tool can do testing and command functions thru the control modules to do the same thing without removing the dash.
Based upons symptoms as well as past experience, it is about 90% chance that it is the control unit and about 10% chance that both actuators have failed
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