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I got my AC fixed last week and now I have a new worry, so I want to ask people who have done the same job. I have a 2016 Audi A4 and I use it every day to drive to work. In September the AC suddenly blew warm air, and a garage told me the compressor was finished. They changed it in one day and the air was ice cold when I drove home, so I was very happy. But since then I hear a low hum from the engine area every time the AC is on, and it gets a little louder when I rev the engine. It is not a loud noise, but I did not hear it before the repair. My brother says a new part can sound different and I should relax. My friend has a Q3 and he said a hum can come from a belt that is too tight, or from the system having too much gas inside. I did not know who to believe, so one night I read about it online. I opened a page about Audi cars on a Sharjah website to learn how the compressor, the belt and the gas pressure work together. It said that after a compressor change, the dryer should be replaced and the gas amount must be exact, or the new part can get stressed. That made me think I should have asked more questions at the garage. Then a coworker told me to look for a Certified Audi AC compressor change in Sharjah next time, and to ask for the part number and a paper with the gas amount written on it. I wish I had done that before. So I have some questions. Is a soft hum after a new compressor normal for the first few days, or is it a warning sign? Should I go back to the same garage and ask them to check the pressure and the belt? Is it okay to keep driving with the AC on until it is checked? And what warranty should I expect on the part and the work, three months or longer? If you had the same hum after a compressor change on your Audi, please tell me what it was and how it was fixed. Thanks a lot.
