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I recently purchased a 1998 ford ranger and the heater was not working. The last owner told me the heater core was leaking and bypassed the heater core. I replaced the heater core and the heater only blows cold air. I touched the heater hoses and one of the hoses was cold. I manually open the valve on the heater control vale and it stared to get warm. How do I find know if it is the heater control vale is bad or if its not getting vacuum threw the hose to open the vale? How does one test vacuum on it?