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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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AC Cooling problem


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.

Jul 17, 2013 | 1997 Jeep Grand Cherokee

1 Answer

The outside unit of my Carrier Air Conditioner/Model # 38TG030300 is freezing up the line going to the unit inside.


Is it freezing up at a drier or just a section of tubing? More info would be good. If the line is frosting up all the way back from the indoor to the out door coil, and I guess that we are talking about the suction line, the larger of the two. My guess it either the stat. is set to low below 72 degrees and or the indoor coil is dirty or the filter is. Clean the indoor coil be careful to not get water else where such as into the furnace take appropriate steps to prevent it. All AC units have to have 400 cfm of air flow for each ton of cooling if the do not have this they will freeze up, vents closed off will do the same as a dirty coil.

Jul 02, 2011 | Heating & Cooling

1 Answer

Why does my one pipe freeze when I run the ac and does not seem to cool very well


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.
Try cleaning the filter or whatever the AC uses to keep the air clean.

Feb 25, 2011 | Samsung Heating & Cooling

1 Answer

'96 seville sls 4.6L, a/c seems to have a blocked passage. high presure line is hot, gauge has 300# on a 80 deg. day, the line just after the orifice tube is cold until freon enters the evaporator, gauge...


what makes u say ur ac refrigerant has a blocked passage? check the low pressure line by touching it with ur hand while ac is running/ it has to be freezing cold/ if not cooling it means ur compressor is weak and or refrigerant is low/ high pressure line is normally hot/ check ac magnetic clutch operation must engage when ac switch is on and disengage when ac is turned off/ check ac condenser must be blocked and needs cleaning....

Apr 09, 2010 | 1997 Cadillac Seville

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.

Aug 25, 2009 | 2005 Chevrolet Equinox

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.

Apr 29, 2009 | Heating & Cooling

1 Answer

Ac freezes up


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.

Jul 07, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

AC not producing cool air


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)

Jun 23, 2008 | LG BG8000ER Air Conditioner

2 Answers

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.

May 09, 2008 | Heating & Cooling

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