re: Central AC replacement

From what I found online nordyne replaced the part # with a different part because the coils were leaking after 2-3 years. They changed it to a microchannel coil. For some reason air is not flowing through the new coil. The AC guy said they sent him the wrong part at first. He got the "right one" sent and it's performing the same.not enough air flowing through it. I'm not an expert on the different types of coils but a Google search gave me the info on the company switching the type of coil. The AC guy assumed they sent him wrong part. Obviously there might be some sort of way to make it work but he obviously doesn't know how and neither do I.