you can go to your local parts store and get a manual shut off valve for your heater that goes in line to stop water flow to the heater core. i had the same problem with the vacuum operated water valve so i put in the manual valve and no more heat in cab!!
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'72 C-10 Cheyenne Super, 402/TH400, Bucket Seats, tilt, tach, AM/FM & shoulder harnesses and a ground up restoration
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