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  1. It's at the dealer right now for the second time, waiting to hear from them. Do you have more info on it? Thanks Tom
  2. I have a 2021 Sierra Denali with about 7,000 miles on it. During long trips on hot days (80+) after about an hour of highway driving my air conditioner starts to blow warmer air and the force of airflow diminishes to the point where there is very little flow temps inside the vehicle are about the same as outside 80+. Seems like it is freezing up, the dealer could not find anything wrong and could not reproduce it. I did reproduce it and drove to the dealer they witnessed it and I have an appointment next week. Anyone else having this issue?
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