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Discussion Starter · #1 ·
I got my 2007.5 Silverado LT 4.8 at the beginning of summer so I never touched the different modes, but now that the weather is changing I notice every time I switch modes there's loud clicks and groans as the system moves behind the dash. Anyone know what's causing this and how to fix it?
 

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Sounds like a blend door or mode door is binding up when it tries to move. Can you have someone work the controls while you listen under the dash on both sides and try to pinpoint the area?
 
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