Air conditioning goes by itself Cruze LT 1.8 l automatic

Hello Cruzler!!! have a stupid problem. when I drive early on the work approx.6 clock turns on while driving the air conditioning. it lights NO lamp from the air conditioning in the car. I can switch the air conditioning completely normal from inside on and off. have observed the error now already two weeks and must say that it is not every day. I can check it by once it gets colder and then in the engine room the thick tube from the air conditioning system (front left) is ice cold and angla ufen. would like to say that the error has always occurred only early until now, during the day I have not noticed it yet. I know it is a stupid mistake and it is also difficult to understand. in the workshop you said I should leave the car with you for a two days, that you can understand the error. the car is now a year old and I was to the first inspection. I only find if this is already longer with the air conditioning is stupid, is finally also my ben Zin. habe LT 1.8 l automatik. has one of you already been able to observe such a thing. or one has a advice for me. THANK YOU LG Hoffi