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Aitconditioner air not blowing cold, return line frosted up?

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  • Anonymous Jun 09, 2008

    I have a carrier unit. Fan and condenser are running, but no air coming out of vents from first or second floor. Thermostat seems to be working fine.

  • ddsw Jun 09, 2008

    I have the same problem. We have two zones. The unit for the upstairs has only been used for 2 seasons. The thermostat is fine, the unit will turn on, but blows only semi-cool air and cannot cool upstairs of our home.

  • burzerko
    burzerko May 11, 2010

    is it the larger of the two lines that is freezing up?

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If it is the larger of the two lines check your filters in your inside unit. Also check to see if the fan is blowing. If both of these are ok most likley you are low on refrigerant.

Hope this helps

Posted on Jun 22, 2008

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Circuitboard or fan motor, (backtrack from the fan motor voltages)!

Posted on Jun 09, 2008

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heatman101

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MOTOR IS RUNNING BUT NOT GETTING COLD


you say motor do you mean the compressor, if so is it making any heat if so it says it is trying to work. common problem if so is a frost build up in frezer on back panel keeping cold air to circulate to refrig. from freezer. also check to see if freezer blower fan blowing air. back to compressor, it has large return line should be cold and a smaller high side line usually 1/4 inch and this should be hot if compressor is doing it's job.check cooling motor by compreesor also to much heat will shut it off.

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Air conditioner not blowing out enough cold air fan is working but frost is built up outside and in on lines


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Refrigerator not working but freezer is


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The Intertherm AC Model B3BV-030K-A is blowing warm air


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Compressor lines


If the large line returning to the compressor is frosting you don't have enough air circulation. Check air filters on inside unit.

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