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Hi,
There are a couple of possibilities here.
If you are not getting any air flow at all near the front windshield, then you probably have something blocking the vents or the doors that control the air flow are not working.
If you have air flow, but it is taking a "long time" for the defroster to do its job, then the AC compressor is probably not working. The compressor is used in defrost mode so that it will dehumidify the air that blows on the windshield. If that doesn't work, then it can take quite a while for the defroster to work.
Good Luck, Greg
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