2007 Volvo S40 Q&A

2007 Volvo S40 Question: Air conditioner is working great and then starts blowing warm/outside air-

Texas 95 degrees-air conditioner works great-then it starts blowing out recycled air. Smells weird and after awhile it will start blowing cold air---then it will blow warm air again. It did it 3 times yesterday. I was driving for over an hour. It has done this before. -
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