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Q: air conditioner blows hot and cold air when it is supposed to be just cool air on 2000 BMW 323Ci

My air conditioner blows hot and cold air. The cooling is very uneven. I have just spent $870. and it is just as bad as it was originally before they "fixed it".
2 valves were replaced, one high pressure and the other one was low pressure.
Very disappointed . It was probably something simple like needing freon....but was told it needed all this expensive parts. I am afraid to go back.
I had some cooling before the repair but nothing like it was supposed to be. I am the only owner, and it had never been recharged.
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Like mine, it may be a simple solution: Check your antifreeze to water mixture in your radiator. Mine was off, causing the AC to freeze up and stop the cold air from coming in. It mainly occurred when I had it set to "LOW' on the AC temp setting. I flushed the radiator, put in the correct mixture and it has worked fine since then. Hope this helps - Good Luck!!
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