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Re: A/c Flapper Issue and Power Window Issue
In the GM service manual for your truck there is a schematic showing what color vacuum lines go to which port- easy to trace the lines and see if one is crossed or leaking. It may also be an issue with the control but I would start with tracing the vacuum lines.
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
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