Can no one help?

Had already posted further down on the topic “KlimA”. Unfortunately no answer. I would help if someone says where the climate compressor is sitting so that I can look for myself. THANK YOU!!! Here once again my problem from the lower posting: Hello, today a request about air conditioning at 2.0 16V, year 96. (No Climatetronic!) In the search I found nothing about my problem. Last week she went still. Then she didn’t cool any more. Have the on/off switch on/off on weekends. As my wife has the car and I work out, she was in the workshop today (free workshop). We had a bill from May 03 from the workshop where coolant was filled up. That’s why we went there. (Has the Omega only 3 weeks.) The master looked at the thing and did something. He then said that something like a “switch” was defective. The system itself is ok. Unfortunately, the machine is not working. He didn’t want to tell my wife what kind of defective “switch” it is. The part should cost about 40 €. For the installation it should be necessary to release the coolant, whereby then of course the filling costs again extra. (zzgl wages) The plant is now (for the first time) again. Wailing contact? The master also wanted to say nothing about the part on express request. (Rumgestammel) Since father-in-law (in 600km distance) is car locker, he might possibly be the part wec When we go to our parents at the end of July, my question: What kind of defective part can this be? Where does the compressor/air conditioning system sit at all? Does the coolant really have to be drained or does the company want to earn more Euro? Thank you for your help. webengel