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My 1970 Chrysler 300 currently has the incorrect HVAC switch because (years ago) I could not find the correct one when the "sliders" inside the old switch fell apart; now I have misplaced the original part number. My car has "standard" 5-button heat and air system, NOT the complex "automatic...

I just charged up my A/C system (non-AutoTemp). The compressor when the clutch is energized, but it doesn't blow old air from the vents. The heater control valve (NOS about 4 years ago) seems to be doing what it should. I'm guessing that it has something to do with the under-dash vacuum...