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Central Air Conditioning

For some reason, the air conditioning upstairs in my 2 story home is not blowing cool air throughout. In the past, one of the rooms upstairs was extremely cold. however, the rest of the rooms upstairs remain hot. We keep trying to turn down, but it will not cool off the upstairs. With it turn down to 60 degrees, the temperature upstairs is still 86 degrees. What could be wrong the air. The once cold room is cold no longer. No matter how low we turn the air conditioner down, it does cool off upstairs. I need help. Let me know your thoughts.

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  • dcdon Sep 03, 2008

    I can not feel air coming out of any of the vents upstairs at all. The current temperature upstairs is 84 degrees. However, the little air frost emblem continues to indicate that the air conditioning is on. However, there is no air coming out of any of the vents in the rooms.

    As for the downstairs which is a little cooler, the temperature is turned down to 71, however, the gauge indicate that the downstair temperature is 74. Let me know your thoughts.

  • dcdon Sep 03, 2008

    I have a fan switch on the thermostat that is we always keep on auto. Should I switch it to on? If so, should I be listening for something to happen? The fan switch has always been set on automatic. What is the fresh air intake and where would it be located?

  • dcdon Sep 03, 2008

    I think it may be the fan. I turned the fan switch to on and nothing happen upstairs. I located the the fresh air intake for both downstairs and upstairs. The downstairs was sucking air because the filter blowing up up in the vent when I opened. The filter was very dirty and I changed the filter. As for the upstairs, I switch to the fan to "on" but did not hear it come on yet. I changed the air filter upstairs as well.

    Should the fan have come on as soon as I switched to on or should there be a delay? If not, I think I have a fan problem with the upstairs unit which is the smaller unit outside of my house. Are air conditioning fans costly? Will that be a part? if so, I have a 5 year warranty on all parts for my new home.

    Again, I look forward to hearing back from you.

  • dcdon Sep 03, 2008

    Great!!! I will call the manufacturer on tomorrow. Is the air conditioning fan different for the upstairs and downstairs? The downstairs is blowing at full blast.

    I will have it looked at in the morning. Again, thanks.

  • Amanda Drew
    Amanda Drew Aug 23, 2017

    That's strange that your AC isn't cooling your upstairs anymore especially that it won't cool down the room that was always cold. Mine has recently been doing something similar in that it sounds like it's working, but my home is still hot. I think that we both will just have to find someone to come out and repair our units.



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Also make sure there are no blockages in the Vents. We had a remodel job and there was material stuffed in the vents which they forgot to take out.

Posted on Aug 23, 2017

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It sounds like a restriction in your ducting. Feel the A/C vents in the hot rooms to see if cold air is blowing out of them. If the ducts are restricted, then it is possible that the air conditioning coils are freezing up from lack of circulation. Inspect the ducts if you can to see if there is any restriction.

Note that even if you feel air coming out of the ducts, it could be ambient as opposed to cold. The best thing is to measure the air temperature coming out of the ducts. It should be around 20 degrees colder than the ambient air at the intake of the A/C.

Posted on Sep 03, 2008

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  • Steve Froese
    Steve Froese Sep 03, 2008

    From what you have said, I would say either the fan is not functioning, or the main duct coming out of the A/C unit is plugged. I would venture a guess that there is a problem with the fan. The indicator on your thermostat will probably not be able to tell whether your fan is actually running, but will only light if the thermostat is telling the A/C to come on. See if there is a breaker or switch for the fan, otherwise the motor may be burnt out. Also, find your fresh air intake and see if you can tell whether air is being sucked into it.

  • Steve Froese
    Steve Froese Sep 03, 2008

    Yes, change the fan switch to "on" and see if you get air blowing out of any of the ducts. If not, then the fan is not working.

    I don't know where the air intake is, but it will probably have a grille perhaps with a filter. Don't confuse it with the furnace air intake.

  • Steve Froese
    Steve Froese Sep 03, 2008

    If you turn the fan switch to "on", the fan will come on immediately.

    Blower motors are certainly cheaper to replace than compressors :), but I don't know how much they are. Contact the manufacturer or local dealer. If it is under warranty, let them deal with the whole thing, it won't cost you a dime. If it is not under warranty and it is just the blower (as opposed to a wiring problem), then you may be able to replace it yourself. Sounds like it's still under warranty though

  • Steve Froese
    Steve Froese Sep 03, 2008

    You hinted that one A/C unit was smaller than the other one, so they are likely to have different parts. They may even be different manufacturers. At any rate, write down the make, model, and serial number of the upstairs unit so you have the information handy when you phone. This information is sometimes hard to find. The serial number is probably a sticker somewhere on the unit, but it may be under the cover. If you can't find the information, just call the manufacturer and tell them that and they will walk you through finding it

    good luck!

  • Lineze Schultz
    Lineze Schultz Apr 28, 2016

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