74 Duster heater valve vacuum or mechanical??

Pete in NH said

I'm going through the same issue with a valve for my 69 Barracuda which has a 70 Dart A/C system in it. The original valve is essentially " unobtainium" unless you find one on EBay at some ridiculous price. The valve needs to be closed with vacuum applied and a Four Seasons 74612 from a 80's Dodge truck application looks like it will work. $7 and change from Rockauto in the 5/8" hose side.

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On my particular 74 the heater core is 1/2" X 5/8" with the heater valve going on the 1/2" side. The proper valve is Four Season 74690 which is 1/2" and normally open. No one makes this type of valve that physically attaches to the fender as the original. At least it will work, I'll just have to zip tie to fender brace.

The $7 valve is plastic, but if you want a quality Chinese made metal valve you have to set up and pay $45.00

Gary