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Is there a check valve in the heater hose that goes to heater core

(1998 Ford F-150)
in Mechanicsburg, IL on January 05, 2013
i can blow through one way but not the other and theres a factory clamp on the hose witch is holding somthing
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Popular Answer
on January 05, 2013
i doubt that there is a check valve maybe a heater core valve
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