Dodge Challenger Forums - View Single Post - 73 Challenger heater box - how does it work!
Old 02-20-2011, 09:32 AM
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scogk6493
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Default 73 Challenger heater box - how does it work!

Hey there,

Does anybody have an idea of how the series of vacuum hoses and such work in the older cars to control vent selection, defrost, etc.? I know there's vacuum diaphragms that move various doors and flaps, but not sure where the actual 'air' or 'vacuum' to make them function comes from..

-Kev
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