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1998 ford f150- heat issue

Where is the heater control valve located on this truck? I have changed the thermostat, acid flushed the heater core, flushed the radiator, fluid is topped off, and still blows ice cold, so this is my next step. The controls work fine. I was told that the heater box needed to be replaced...exactly what this is I'm not sure. I'm thinking it's the housing for the blend control. Any ideas? Thanks in advance, Rich B.

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There is no heater valve on a 1998 ford F-150. The hoses for the heater lead directly from the engine and go to the heater case. PS The heater doors are all vacuum controlled so you might wanna look under the dash for any lines that might be disconnected

Posted on Jan 28, 2009

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No heat 98 ford f150


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If everything is fine with gauge heat, check the hoses going to your heater core with your hands. they BOTH should be hot. If one is hot and another is warm then you have heater core issues. If both are HOT then you may want to check your temp controls. either temp control may not be working or the door that changes temp may be stuck in the cold position... there are many things, but checking the heater core hoses are most likely going to reveal bad heater core.

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