Omega B Caravan Facelift Automatic air conditioning does not cool properly

Hello guys, I drive an Omega B Caravan Facelift, 2.2 Edition, EZ 06/2003, engine Z22XE, with automatic air conditioning. Today we had eary +29,5°C outside and the automatic air conditioning should cool up and the car. AUTO was set so that the cooling compressor also runs. But the thing just heated, not cooled. Even at the lowest setting LO, somehow only warm air came out. I then already used the actuators according to user manual synchro cold air doesn’t come out. I admit that I didn’t use the automatic air conditioning system as recommended at least once a month with switched on cooling (AUTO), but is that supposed to be the trigger? Does anyone have an idea what else to do. Thank you very much in advance. Klaus