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AC/Heater blend knob 2001 Silverado

B

Ben1943

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I’m not able to blend AC temp or heater temp with center blend knob. AC & heater works, but can’t adjust temperature. Full AC or full heat only.
 
Welcome to thetruckstop Ben.
Probably a failed blend door in the system.
I would not know which one nor how to diagnose the issue.
I am sure there are some in here that do have the wisdom and the knowledge to do so, so, Hang in here.
 
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