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What do i do if my ac freezes up? I already cleaned the filter.

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On an A/C unit in a car/truck? or on a Central A/C???

Posted on May 30, 2010

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How to check air flow on a window unit ac

Clean the filter. If the coil is frozen it will not be producing much air. Turn it off for a while until thawed. Then restart machine. If the blower is working and the filter and coil are clean then you are low on refrigerant

Jun 17, 2017 | 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

2 Answers

The unit freezes up

When a AC freezes up the most likely reason is that the evaporator coil (the one the cold air comes from) is 'dirty,' and/or the filter (that goes in front of the coil) is also 'dirty.'

Be sure to defrost the unit (if it isn't already).

If it presently has ice on it - just turn the unit to FAN ONLY and allow it to completely defrost (all ice gone).

Then: Be sure the filter is 'clean' and air can flow through it.

Be sure the coil is also clean.
Note: if the coil is dirty you can usually clean it fairly easy with a brush. Often (especially if the unit is freezing up) you can actually 'peel' a layer of 'wet matted stuff' from the coil by hand.

Another reason (less likely one) for the unit freezing up - is that the fan motor is going off (when it shouldn't) and the "lack of any air" over the coil is causing the unit to freeze up. You didn't say anything about the fan motor not running so it's not likely this is your problem - but be aware - that fan motors can get hot and will go off on internal overload - UNTIL - it cools down and then will come back on - so - if you're not watching - it's possible the motor could be "heating up and going off (for 30-90 minutes) and coming back on" without you realizing it, which would cause the unit to freeze up. Like I said - this is not likely though. If, however, it is doing something like this - the 'sure-cure' is to replace the motor. The cost to replace a blower motor will be somewhere in the neighborhood of $200 which should cause one to think about buying a new unit.

Another reason - also 'less likely,' is that the AC is 'low on refrigerant.'

If - after checking the filter/coil - you find that they are both clean and not causing the problem - and you've watched the fan motor and it's not going 'off and on,' then, you must consider that the unit is 'low on refrigerant,' which will require a Service Tech - who has the expertise and tools to repair the leak and re-charge it. If this is the problem you're probably looking at a repair bill of $75 -$125 - which when considering the price of 'new air conditioners' might cause you to think about buying a new one.

Hope this helps.

Jun 10, 2010 | Friedrich CP12C10 Wall/Window Air...

1 Answer

Freezing Goodman pipes

make sure the filter is clean. also the evap coil should be clean. if none of these then your system is probably low on charge. hope this helps

Jun 05, 2010 | Goodman CKL42AR42 Air Conditioner

1 Answer

Freezing up, home ac unit no air flow after running a while

A low freon level in the unit can cause them to freeze up. Are the fins behind the filter clean?

Jun 19, 2009 | Whirlwind FH-778 Air Conditioner

1 Answer

Ac freezing up

Most freezing is caused low refrigerant or temp control will not shut off unit if there is no humidity problem.
one or the other can be checked by an refrigeration tech.

May 01, 2009 | Ruud UBHC Air Conditioner

2 Answers

My ac unit

air conditioners freeze up for one of 2 reasons, #1 restricted air flow, is the filter, /orthe evaporator (cool) coil clean?
#2 it is low on freon, causing the coils to be colder than they should be.

Nov 13, 2007 | Heating & Cooling

1 Answer

Ac ices over

First you need to make sure the filter is clean to allow good air flow through the evaporator. If the filter is clean make sure the evaporator is not plugged up with dust and lint. If all that is ok your problem is the a/c BTU's is to big for the size room you have the a/c in and it is getting the room too cold. If that happens the evaporator will ice up and will not cool the room.

Jul 08, 2007 | Haier HWR06XC5 Wall/Window Air Conditioner

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