When in anywhere in between, does the fan speed change? Let it run for a while before concluding. Can you hear a change when turning temp wheel to extremes? The AC does not work in the SD, belt wrapped itself around pulley when I engaged. The AC in CD [do-da-do-da] does work, fan speeds change in both. The CCU is famous for failing, but check the foam tube first.

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83 SD

84 CD