1966 heater box with AC question
August 31st, 2021, 05:35 AM
#2
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
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It controls the flapper door for air recirculation vs outside air. Vacuum to both ports gives you 100% outside air. vacuum to the upper port gives you 20% outside/80% recirc air. And yes, this is in the CSM, chapter 1C. 
August 31st, 2021, 10:47 AM
#3
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Posts: 133
Thanks again Joe. Apparently it is a BOP thing and Chevrolet did not use it.
August 31st, 2021, 11:27 AM
#4
Old(s) Fart
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Location: Northern VA
Posts: 47,669
August 31st, 2021, 12:46 PM
#5
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