We checked this on the outside of the transmission by placing a mark on the shaft and then going through the gears. The shaft is turning and rising up and down as the shift levers move. That doesn't mean it is doing anything inside the transmission.
Since most are convinced it's the clutch, we are going to bite the bullet and pull the transmission back so we can examine the clutch.
OK so I looked at my 2017 Spark's (outside) airflow control. Our other car has 2 separate buttons for choosing between open or close to outside air. My Spark has no such buttons. So I conclude and concur with Mr.tozzi that turning of A/C but leaving the fan running at chosen speed would bring in some outside air.
I would add that make sure the cabin filter is not clogged.
I can have it checked out I guess. I live in Mexico, out in the desert. Are the AC systems the same on the '17s and the '10s? I crank shut off the vents except for the driver side, blast the AC on full for, like I said, at least five whole minutes to bring the temp down (doesn't help that the car is black). Sitting in the shade while I do that, though, makes a world of difference. Without it, it's just not quite enough.
General Motors’ Customer Care and Aftersales division announced at NACE automechanika Chicago, the largest U.S. trade show dedicated to high-end technical and management-related training for automotive collision and service repair shops, it will launch a comprehensive collision certification program in 2018.
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