Question about 1998 Ford F150 Regular Cab

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No hot air .

I have a 1998 F-150. I can not get any hot air to blow from my heating system. Temp. selector has no effect on the temperature of the air. when I turn the A/C on it seems to work fine. I have replaced the thermostat, checked the flow through the heater core, and replaced the otensiometer (don't know how to spell it. I mean the temp. control ). I still have no hot air.

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  • Anonymous Nov 22, 2008

    1995 F150 NO HEAT JUST COOL AIR.HOSES HOT BLOWER WORKS HEATER CORE HOT.

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  • 55 Answers

The blend door motor could be bad or the door itself could be broken inside the heater box. big job to fix that, the entire dash has to come out.

Posted on Oct 16, 2008

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I have a 2000 oldsmobile bravada and it's blowing hot air even when the temp is turned down. Do I need to replace the thermostat?


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Hello, this is cused by the drivers side temp door actuator. there are two electric motors that move the temp doors from cold to hot. there is one on the drivers side and one on the passenger side. you will need to replace the one for the drivers side.

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    I have the same problem with my windstar blower is fine but is coming cold air but no heat i dont know what to do can any one show me how to fix it thnx


    First, feel the heater hoses going into the firewall under the hood. If they are hot, then you have hot engine coolant going into the heater core. If they are not hot, then you either have a bad thermostat or you are very low on engine coolant.

    Next you need air flowing through the heater core so it can come out heated through your vents. If the iar is flowing somewhere else, your temp blend door is not moving because the bend door motor is bad or your temp knob on your heater controls is bad. The blend door motor is an electric motor.

    ------------------------------------------------
    Air Flow Control
    Air flow control is accomplished in the following manner:
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    e72a310.gif

    • Movement of the control knob from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
    System uses a reheat method to provide conditioned air to the passenger compartment.
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    --------------------------------------------------------------------------------------------------------------------------
    inside you plenum box:

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    Heat (or lack there of)


    The heat source for the fan is probably comes from the liquid coolant in the radiator. Since the temp gauge shows it to be warm, my assumption is that there is no hot liquid getting to the heat element in the AC/heat plenum.

    Do the controls feel any different than they usually do? I'm assuming you have probably been using the system in the AC mode during the summer. I would try to see what happens when the different heater controls are moved. Somewhere there is a valve that is not being actuated, or a vent door that is not moving. My experience (personal) is that a door that controls air flow is not operating and that's because it has sat in one position all summer. Sorry I can't be more specific.

    Hope this helps Good luck Loringh

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