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A proper mix of antifreeeze and water boils around 235F add 4F for each lb pressure on your rad cap under 200 is definately not a problem

do you mean a valve on one of the heater hoses?? Wasnt necesarily required as the heat can be controlled by either a valve (allows coolant to flow thorugh the heater core when heat is selected) or by a flapper in the heater box (directs the heat where you want it)...