Question about 1999 Ford Expedition

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1999 expedition 5.4 cold air from dash vents, hot air from rear vents with a/c on max and all fans wide open. any thoughts?

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  • ian brenner Apr 23, 2010

    thanks pal. just charged the system and moments ago verified system operating pressures, so i will rule out answer two at this time.


    the mix door idea is intriguing... there must be separate mix doors front and rear? is that possible?

  • ian brenner Apr 23, 2010

    i'm having trouble visualizing a problem with the mix door. if there is only one mix door, why would i get 44 degrees temp from one vent and ambient temp from another?

    are there more mix doors on this vehicle?

  • ian brenner Apr 23, 2010

    where is the rear evaporator located?

  • ian brenner Apr 23, 2010

    thanks, i will look. i appreciate your time and effort!

  • ian brenner Apr 25, 2010

    ok, one more time... please answer only if you are an expert.


    the system operates with 2 evaporators; front and rear. front blows cold, rear does not.


    system operating pressures are normal; both high and low pressure sides.

  • ian brenner Apr 30, 2010

    dj_relly is on the ball; DARKLORD1 IS CLUELESS!

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Hi! If all the thermostat are set correctly then I suspect the rear evaporator coil. This may be dirty and requires cleaning. Once cleaned I believe that cool air will be blowing, thats for sure not unless the evaporator has a leak. Hope this helps and have a good one!

Posted on Apr 23, 2010

  • dj_relly999
    dj_relly999 Apr 23, 2010

    Hi! Try looking at the rear, a black box could be on cover.

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It seems the air is possibly getting warmed up before it can reach the back vents,, or it could be the air isnt getting cold enough or that the ac / heater door for the back is stuck..

1.) you will need to trace the vent unit back to the blower below the dash,, you will notice its like 1 long tube that every things runs from.. The one to the back is connected to this tube,, enuse it is so and securly.. on the tube is a vent door, make sure its moving,, check your temp and controll settings on the ac control unit and make sure its working..

2.) Check your ac freon (gas) make sure you unit isnt leaking or needs regasing .. this causes this as well.

Posted on Apr 23, 2010

  • Rishi Roshan Ali Apr 23, 2010

    the unit use 3 seperate hoses ,, 1 for the front,, one to send to the back and another for the back.. They just fit into one another without any fasteners,, chances are oon of them just slipped out,, and yes there 2 mix doors,, not so much for cooling but more so for heating!!

  • Rishi Roshan Ali Apr 26, 2010

    then the rear evaporator isnt working.. the evaporator is what colds the air.. The unit doesnt have a shared colding system but two individaul ones controlled by the same unit.. chect the rear evaporator to see if its getting power,, you can do this with a multi meter on the contact wires (where the wires connect) ,, once its getting power it means that something is wrong with the evaporator.. if it isnt getting power ,, the rear evaporator has a seperate fuse.. the fuse is located under the hood in the fuse box,, under the fuse box cover is a diagram showing where each fuse is and what it controls..

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