Re: GMC 1962 Delux heater core, external valve
That look like a thermostatically control valve (temp control valve). Years ago I had the same problem in one of my old car and I found someone in Hemming Motor News that would overhaul them. I had sent mine to him and it came back looking and operating like new. That might be a good place to look to see if there is still someone that overhaul these valves.
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