Ac head unit

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corvette744

2004 Z-71
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AC head unit-Do when i have the heat at 90 and turn the temp dial down 1 degree to 89.The temp drops to cold no slight drop in temp cold or hot.I am assuming its the head unit starting to fail cannot find any info on it.Am i looking at a new unit or blend door before i start looking into it hoping someone already fixed same problem.
 

B-train

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What year and model?

I had a 2003 that would do that for the passenger side controls and it ended up being the blend door.
 

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