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It could be that the unit is overcharged and the compressor is shutting down on overload. Check to see if the compressor is running when the hot air starts blowing.

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โˆ™ 2006-08-29 17:59:21
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Q: Why would the central ac blow cold air for about 30 minutes then start blowing hot air but the unit isn't frozen and is full of refrigerant?
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