I'd recommend you remove the glove box and check out the blower fan. The AC blower is behind the glove box. Follow the DIY for removing the glove box. Essentially, you open the glove box and pull upwards on the door to pop it loose. Then you disconnect the tension cord on the left side (pop out the rivet that holds it). The box itself is held in place by 3-4 screws across the top, one on either side, and one more deep in the mid-right-back (look for others, but I think that's it). Then the whole assembly just pulls out. You'll be looking at the white plastic of the blower and the filter door is just above it. Try pulling the filter and seeing if some leaves or debris fell into the fan.
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2013 Cadillac V-Wagon, RIP Z
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