Friends, the weather started to warm up in Antalya and the need for air conditioning started. I have never used the air conditioner since last summer. When I opened it today, a sound started to come from inside the air conditioner. It sounds as if they are blowing into the pipe. I wonder if it could be from the fans, but there is no abnormality in the speed and sound of the fan. Especially in the air conditioner there is a blowing noise increasing to the gas pressure. In addition, the air-conditioner that blows like a refrigerator last year is 50% lower this year. Let's say it may be from this gas, but what could be the source of the sound. When I open the hood there is no slightest similar sound. Probably a blow from the plumbing. Can someone who has knowledge or happened before enlighten?