In the context of the Citroen C5, "cut air conditioning" likely refers to a feature or setting that allows you to disable or turn off the air conditioning system temporarily. This feature can be useful in certain situations, such as when you want to save fuel or reduce the load on the engine by not running the air conditioning when it's not needed.
When the air conditioning is cut, it means that the system will stop cooling or heating the interior of the car. The fan may still continue to blow air into the cabin, but it will be at the ambient temperature rather than conditioned air.
If you have a Citroen C5 and want to know how to activate or deactivate this feature, you should consult your vehicle's owner's manual. The process may vary depending on the specific model year and trim level of your Citroen C5. Usually, there will be a button or control on the car's dashboard or climate control system that allows you to toggle the air conditioning on or off.