OE Style Quality Replacement Single Vacuum Port Inlet & Outlet For Coolant Clearly Marked Water Flow Shuts Off Coolant Flow To The Heater Core While The Air Conditioning Is Running Air condtitioning not cooling as good as it used to? Check the heater control valve first before calling your AC mechanic. This little valve just might be the culprit and it is very easy to fix.
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Chevelle Heater Control Valve, 1968: