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· Super Moderator
2010 DTS
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89,562 Posts
What you are hearing is the mode door. Your problem sounds like the air mix door actuator. There are two. One for the drivers side and one for the passengers side. One is visible from the top after removing the glove box. The other from below after removing the lower insulator panel. When you run the temp up and down you should see both actuators move.
 
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