Question about 2004 Kia Sedona

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My 2005 Kia Sedona is blowing hot air. The compressor is working and the refrigent is charged.

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  • arebeccalynn May 07, 2010

    The coils are not cold. Even with the AC off and just the fan blowing the air is hot.

  • arebeccalynn May 07, 2010

    The coils did not get cold with the engine on. The air also runs hot when the AC is off and just the fan is blowing on the cold setting.

  • arebeccalynn May 07, 2010

    how do we know if it is electical or mechanical? Do you know what it would look like?

  • arebeccalynn May 07, 2010

    it is not ice cold no. Even when the AC is off and just the fan is running the air is hot. The day after we charged it the AC ran cold but after that it stopped.

  • arebeccalynn May 07, 2010

    low pressure is around 40 psi

  • arebeccalynn May 07, 2010

    the low side line is cold. We don't know the high side pressure because we don't have a kit. The evaporatoe is hissing. Is it supposed to do that?

  • arebeccalynn May 07, 2010

    the lines next to the evaporator but not the next to the low pressure fill port

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2 Answers

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  • Kia Master
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Is the low pressure AC line cold whern the AC is on? the low pressure line is the large line, it should be ice cold when the compressor is running. let me know, also would like to know high and low side pressures, do u have a AC gauge set?

Posted on May 07, 2010

  • 3 more comments 
  • yadayada
    yadayada May 07, 2010

    U did not answer my questions, is the low side line ice cold with AC compressor running? what is the high side pressure?

  • yadayada
    yadayada May 07, 2010

    why not just call me at home 925-577-7157

  • yadayada
    yadayada May 07, 2010

    yes the hiss is the high pressure bleeding down to low pressure, that is how it gets cold, is the evaporator core cold, gave the opportunity to call on this please use it, it is complicated to diagnose an AC system.

  • yadayada
    yadayada May 07, 2010

    is the evaporator getting colds, thi is very important.

  • yadayada
    yadayada May 07, 2010

    call please, I am on the west coast of USA 925-577-7157, I think we have a communications problem, not sure u understand what component is what.

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  • Master
  • 755 Answers

Is it hot with or without the AC being on? Maybe the mixer valve is hung open or stuck on hot? The compressor does come on and stay on right? And your accessory cooling fan does engage as well? Feel the AC coils in front of the radiator and see if they are getting hot or cold too.

Posted on May 07, 2010

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  • john andrew manchook May 07, 2010

    If its always hot no matter what setting you put it on your heat selector is probably stuck or disconnected!



    You need a manual to check how the selector works. Is it mechanical or electronic?

    Mechanical selectors usually just need some lubrication and a little help at the diverter valve.



    Electronic units are a bit more tricky and you need to check a manual to get wiring plug reading values to check. Usually leading to either fixing a power supply problem or replacing the units circuit board.



    I see another expert is talking to you. I am sure he is running a similar dialogue with you.



    Keep at it! You are getting there.

  • john andrew manchook May 07, 2010

    I think you can go to your local library and see if they keep a manual for your vehicle in their reference section.



    Also, a look on a autoparts website can show what parts they have for your heater control. That way you know what style it is if it turns out to need replacing.



    So, it ran cold for one day and then it stopped? You might want to check your charge level again!



    You may just have a really bad leak. If you bought a charging valve with a guage pop it on with the system running and read it. See if it leaked back down to refill level again.

  • john andrew manchook May 08, 2010

    evaporators do hiss a little after you turn the vehicle off. Its just bleeding down the pressure side of things.



    You low side pressure seems spot on. I think you are looking at a control head problem that has left you with heat only.



    Can you make it hotter? Is the heat cold selector working? If you have buttons to choose heat or vent or ac then you controller is probably a circuit board of some kind. Perhaps you have a stuck relay in the AC/heat controls? You need to get a look at a service manual *(library reference sections have them) and find the relays for your climate controls and check them for function.



    Your descriptions have been good. I think you might have this one cornered!



    Keep me posted ok?



    Thanks!

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