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Q:

AC temp control on passenger side does not work on 2001 GMC Sierra 2500 HD

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
passenger side air is hot no matter where control is set.
(1) Answer
You may have a failed temperature door actuator for the passenger side of your 2001 GMC Sierra. Fault codes stored in the AC control module would help to confirm this. You will need a scan tool to access these fault codes.