You didn't say if your truck had factory a/c or not. If it has a/c then what is said about the vacuum to open and close the valve is correct. If it doesn't have a/c, then it should have two temperatures. Hot and really hot. Buy the manual shut off valve to keep hot water out of the heater coil.
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72 Super Cheyenne Longbed 350 49,000 original miles and My dad ordered it new
66 Chevy Caprice 2 dr
77 Caprice Estate Wagon
New Palestine, IN
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