YES, We can repair liquid to air heat exchanger coils that froze with water in them.
It may not be all that pretty, but we have been functionally able to repair heat exchanger coils from air handlers where water got in them and they froze, resulting in loss of liquid integrity. There typically is a slight loss of efficiency do to a reduction in number of tubes or loss of fin area. However, the degree of loss is generally insignificant and it is cheaper/faster than getting a new replacement coil that exactly fits the space.
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