2002 Gmc Sierra Heating Dampers Operate Outside Temperature Gets Down 10 Deg F

143,000 MILES
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My 2002 Sierra heating dampers do not operate when the outside temperature gets down to ~10 deg.F . Where are the AC/heating dampers located?
Dec 27, 2012 at 10:15 AM
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JDL
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  • 16,098 POSTS
Should be under the dash on the passenger side. click on the link.

http://postimage.org/image/k21a1ghef/
Dec 27, 2012 at 10:32 AM
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