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AC lines freezing - will not cool - Weather King Heating & Cooling

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This is most likley one of two things at work here. Check your filters and make sure your fan inside the furnace or air handler depending on the case is moving air. If this fixes the problem great. The next thing that may be wrong is a low refrigerant charge which if this is the case you will need a licensed professional to come out look for where it is escaping fix the problem then recharge the system.

Please rate this honestly.
Thanks Bur

Posted on Jun 20, 2008

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Posted on Jan 02, 2017

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Well the blend door theory would work if the ac never got cold. But you say it starts out cold and then gets hot.
Its possible the system is freezing up due to lack of air flow thru the evaporator, or a blockage in the freon lines.
You would need to watch the high and low pressure gauge readings as the system gets warm.
You may need professional help for this.

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If the return line is freezing, as you describe, it typically means that you aren't getting enough air across the expansion coil, causing a large block of ice to build up inside.
Once that happens, you'll always get ice on the return line.
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1 Answer

AC freezes up after running two hours.


If it actually is freezing up,the low pressure switch is the likely cause.It is screwed into the large ac line near the firewall,witch is the cold line.If it is not there it is in the dryer,near the firewall,or under the air filter box.Follow the ac line(large ac line/hoses)from the ac compressor untill you come to the switch,that is the easy way to locate it.This low pressure switch causes the ac compressor to cycle on and odd according to the pressure sensed from the ac low side line.When it gets really cold the pressure is lowered,and there for it will cut off,and when the pressure rises,it cuts the ac compressor back on.It would be a really good idea to check the freon in the vehicle first.If the ac system is low on freon,it will freeze up on some vehicles.

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1 Answer

My ac compressor works while i am recharging it and keeps running as long as the car is running when i turn the car off and on again it wont run


Look on the cold line just before it goes through the firewall you should see a pressure switch. This switch may be bad. It has contacts that open and close to keep the compressor cycling and prevents the compressor from freezing the lines.

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1 Answer

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Exactly how much refrigerant did you charge into the system when you recharged it? If the suction pressure is varying that much you most likely over charged the system and got a liquid flood back which took out the compressor valves.

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1 Answer

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If this is a newer system there will be a freeze sensor. It may be low on refrigerant. I would check the obvious things first. Are the filters and coils free of debris? Finally only set the temperature to your comfortable temp not lower as this can cause freezing too (generally not below 70 degrees)

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My AC unit keeps freezing up on the copper lines going into the house from the outside unit. It also freezes up on the inside lines and the air is not cooling my home down.


Operate your air conditioner with the fan in the on position. But first turn the fan on, turn the temp up or shut the cooling off. Your coil is more than likely frozen over. At night when outside temperature drops the refrigerant pressure and temperature in the system also drops. This action can cause icing of the cooling coil, with the fan in automatic everything shuts down at the end of a cooling cycle. Thus no air movement to melt ice on previous cooling cycle.

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