This problem is a natural one you have had to expect for several years already for your car. Especially if the vehicle is a little older, I had such a problem, and I did the remarkable stupidity of changing the entire air conditioning system that if I told you how much it cost me, you would pass out. I would advise you initially to unbutton the whole system, clean it up and then see which parts and how they work. Later if you have to change some features, I advise you to go on
socool.sg [socool.sg] and see an appropriate price list. But if you find it even cheaper, plus good quality, I will be glad for you!