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Not fimiliar with the 5.0 but it sounds like an air lock between the out hose from the heater core to the bypass.If the hose makes a valley between the two and then heats up from engine heat the water wont flow.Run the engine and then loosen the hose clamp and hopefully the air will get pushed out.Thats all i can think of. How do you shut off the heater in summer if there is no shutoff valve in either of the heater core hoses? Always use Ford thernastats as after market ones are designed a little bit different at the spring end.
Last edited by gobber; 11-08-2005 at 08:41 PM.
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