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Reply to "Consol vent cable"

The '71 cars had that feature which allows fresh air to enter the cabin via the heater/AC box and dash vents.  When the dash lever is in the "AIR" position, outside air enters the cabin via the heater/AC box and dash vents.  However, this fresh air bypasses the heater/evap core.  If you are using the heater or AC and have the the lever in the "AIR" position, you will be tempering the conditioned air with outside air of the "wrong" temperature, effectively lowering the heater output temp or raising the AC output temp.  

John

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