1998 Ford Expedition Logo
Anonymous
Anonymous Posted on Jan 08, 2010
Answered

98 expediton heater puts out warm air only ,heater hoses are hot . vane door seems to be working . Is there some type of thermostat in the dash. It has standard heat & ac

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  • Anonymous Jan 08, 2010

    go to hearertreater.net they have custom made temp. bleed door replacements that are not plastic,and videos of how to replace them.

  • ksoren1779 May 11, 2010

    I have simular problem with same year Expedition 4WD, 4.6L. It blows warm air for a few seconds and then cool (not cold). I have the manual control System with Aux AC/heater. All the selector positions front and rear work with great air flow. I have removed the center console and can view the actuator motor turn as I change temp from cold and hot (axle seems to move approx 90 degrees in both directions). AC works great everywhere. System has recently been flushed and new thermostat installed. New fan clutch also recently installed. Could this also be a Blend Door problem or should I look for something else?

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2 Answers

gerry bissi

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  • Ford Master 4,390 Answers
  • Posted on Jan 08, 2010
gerry bissi
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I would say blend door is not working.

Manual A/C
The manual climate control system heats or cools the vehicle interior depending on the function selector position and the temperature selected. The function selector position determines heating or cooling and air distribution. The temperature blend control setting determines air temperature.
The manual climate control components are used to:

  • select air inlet source (outside or recirculated).
  • select blower motor speed.
  • select discharge air temperature (temperature blend).
  • select discharge air location (defrost, panel, floor).
  • select A/C compressor clutch operation.
--------------------------------------
Actuator —A/C Electric Blend Door Removal and Installation
All vehicles
  1. Remove the front seats. For additional information, refer to Section 501-10 .
Vehicles with center console
  1. Remove the center console. For additional information, refer to Section 501-12 .
Vehicles without center console
  1. Remove the floor duct panel.
    • Remove the pin-type retainers and release the expander clip.
All vehicles
  1. Remove the LH and RH scuff panels.
  1. Remove the RH and LH cowl side trim panels.
  1. Pull back the carpet.
  1. Remove the pin-type retainer and the rear footwell duct.
  1. Remove The RH instrument panel brace.
  1. Remove eat LH instrument panel lower nut and position the brace aside.
  1. NOTE: Rotate the vacuum control motor to disconnect the vacuum control motor rod from the panel/floor door.
    Remove the panel/floor vacuum control motor.
    1. Disconnect the vacuum lines.
    1. Remove the screws.
    1. Slide the rod out of the door and remove the panel/floor door vacuum control motor.
  1. Remove the floor duct.
    1. Remove the two screws (one each side).
    1. Remove the floor duct.
  1. Remove the temperature blend door actuator.
    1. Disconnect the electrical connector.
    1. Remove the screws.
    1. Pull down to release the actuator shaft and remove the temperature bleed door actuator.

Ronny Bennett Sr.

Ronny Bennett Sr.

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  • Ford Master 6,988 Answers
  • Posted on Jan 08, 2010
Ronny Bennett Sr.
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Look ,behind the glove box,on top of the hac box,toward the center of the truck,it is a flat box,with a multiple wire plug in it,it is the temp door actuator motor,that turns as you select the cold,to hot selection,it may not be turning all the way for hot.You can remove this motor,and turn it,yourself to see,it is hard to do,because it is ressesed in the box.

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Does the engine reach operating temp, hopefully over 200 degrees F. Are the heater hoses hot to the touch?
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I have dodge caravan 95, 205,678 miles and seems running really well, the only problem is, there's no hot air, i replaced the thermostat a while ago, still blowing cold air.and checked the coolant it's ok,...
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