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It's just a guess without more data but perhaps the core has frozen over and air can't pass through it after running for 45 minutes. The fan continues running and the air that should be passing through the core is forced through cracks/leaks in the the heater box. A qualified AC technician can check the unit (particularly the expansion valve) to determine if it is freezing up.

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โˆ™ 2006-04-03 18:09:26
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Q: Why does it sound like the air from the AC is being blown behind the dash after the AC runs for about 45 straight minutes?
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