It is normal. When you defrost, you need fresh air to enter the vehicle. If you continue to recirculate the cabin air, the windows will eventually fog. You will get a small area on the windshield where the air hits that you can see through, but the rest will fog. You want fresh air to defrost.
Let me know if this answers your question.
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Sunday, January 9th, 2011 AT 11:06 PM