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Why would a car air condition freeze?

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Answered 2007-06-20 13:13:47

Low air flow. If you have a low air flow as produced by the fan blowing the air cooled air inside, then the coils will have a tendency to freeze. The explanation is that the air flow, warms the refrigerant up as it cools the air in the process. If the air flow is low, the refrigerant does not heat up as much, so that when it loops back to pass through the expansion valve, it is starting off cooler than before and thus becomes colder with each pass, until the coils freeze up on the inside and the AC fails to work properly. Low refrigerant. The second issue of the refrigerant being low in the unit is based on the above principle as well. Remember that when the freon passes through the expansion valve it expands and thus cools. Well, if there is less refrigerant in the coils as it passes through the expansion valve, then the refrigerant is allowed to expand even more than before because it has more room. Since it can now expand even more, it will thus cool that much more. As the refrigerant level drops, this expansion increases more and more, until this chilling process begins to freeze up the coils on the inside and the unit fails. So have your unit checked by a professional. You more than likely have a leak and it needs to be repaired before adding more refrigerant.

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