Question about 2000 Ford Expedition

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99 expedition heater valve

Does the same heater valve control the front heat and the rear heat in my 99 expedition?

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  • 3 more comments 
  • ryan_n_wky Dec 15, 2008

    why would my front heat only work part time or not at all and my rear heat work fine? one of the blend doors not operating?

  • yadayada
    yadayada May 11, 2010

    U hit the nail on the head.

  • yadayada
    yadayada May 11, 2010

    there is no heater control valve, only blend and air diversion doos.

  • Anonymous Mar 16, 2014

    rear subwoofer wattage

  • Anonymous Mar 28, 2014

    Leaking radiator fluid from rear of 99 expedition

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  • Master
  • 3,533 Answers

Yes to the first question
and yes it is the blend doors
recommend get another unit for the control or take that control out and see if one of the tubes is broken off the control unit

Posted on Dec 31, 2008

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1 Answer

All my heater vents blow air when heat is on, but only the front gets warm air...all rear vents only blow cold air no matter how you have the heater set...not sure what the problem could be.


there is a diverter valve that lets hot water from the engine into a heater core, which is a device like a small radiator, which heats the air when it flows past. there is probably a second heater core for the rear. the valve for that one, or the switch or relay to control it is bad.

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Front heat works, but rear blows cold air only


With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps

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Can not find heater control valve 2000 expedition


what year? for 2000, there are no control valves. It mixes a/c air with heater core air to blend the right temp.

SECTION 412-02: Heating and Ventilation 2000 Expedition/Navigator Workshop Manual
DESCRIPTION AND OPERATION Heating/Defrosting The heating and defrosting system has the following features:
  • Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle.
  • Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level.
  • Controls the A/C blower motor speed.
  • Cooling or heating can be adjusted to maintain the desired temperature.
  • Uses a reheat method to provide conditioned air to the passenger compartment.
  • The blower motor draws outside air through the A/C recirculating air duct, except for MAX A/C cooling, when recirculated air is used.
  • All airflow from the blower motor passes through the A/C evaporator core.
  • The temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • The temperature blending is controlled by the temperature blend door, which regulates the amount of air that flows through and around the heater core, where it is then mixed and distributed.
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Dec 01, 2009 | Ford Expedition Cars & Trucks

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Why does my Heater blow cold air in the front


its the blend door behind the glove box. I had the same problem

Nov 11, 2009 | 1998 Ford Expedition

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99 Expedition blows cold in front but not in rear cabin. Heater will work in rear, but no A/C. Front A/C and heat is normal.


somewhere in the cabin there is a panel, behind it there will be a small vacuum valve that opens duct heat/cool for the back. I had it go bad in a windstar and stuck on heat, too lazy to replace so i'd pull panel and manually move it once or twice a year

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No back heat in Expedition, Blows cold air but front works fine


Shelly,

Buy used parts at car-part.com. Look on page with * to find the cheapest part. Coud be your temp blend door (#2) may not be moving back and forth. Or, you are not getting hot water to the rear heater core.

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You may have to crawl under the truck and feel the heater hoses to see if they are hot. You will find a group of 4 lines, 2 for heater and 2 for a/c. If hot, you know hot water is getting back to the heater core. If not, there may be a hot water vave that's not working. Not sure if EXP. has a water valve for rear.

Let us know what you you find. Good luck.

Feb 22, 2009 | 2000 Ford Expedition

2 Answers

Heater valve


there is no heater control valve in this truck, heat control is done through what are called blend doors. So the issue may be the front blend door motor has failed, this is very common on all Ford heatimng systems except the Focus.

Dec 15, 2008 | 2000 Ford Expedition

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