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Old 03-20-2012, 07:22 AM   #1
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A. C.

Ac is freezing up. Any ideas on why and how to stop it. Thanks in advance.
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Old 03-20-2012, 07:49 AM   #2
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Two possible causes, fan not working properly (easy to tell) or freon charge is low (most likely). I know sounds counter intuitive but a low freon charge will cause an AC to freeze up. A competent HVAC place should be able to service the unit.
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Old 03-20-2012, 08:51 AM   #3
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Thanks a lot fan is working fine so I guess a call to the hvac man is in order.
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Old 03-20-2012, 09:26 AM   #4
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Quote:
Originally Posted by Shadowcatche View Post
Two possible causes, fan not working properly (easy to tell) or freon charge is low (most likely). I know sounds counter intuitive but a low freon charge will cause an AC to freeze up. A competent HVAC place should be able to service the unit.
Actually, low refrigerant (Freon) is the least likely reason for the A/C freezing. 9 time out of 10 the issue if low air flow. Save your self some money and do some simple maintenance on your A/C.

-Take off the inside cover and clean the filters. They need to be cleaned about every 2 weeks of normal use.
-Next, look up in the unit to the evaporator coil. It should be clear of any lint built up.
-Check the unit housing for any internal bypass leaks of the air. Air leaking from the outlet side of the fan assembly to the inlet will cause it to freeze up.
-DO NOT run the fan on low speed.
-Check to see that the freeze sensor bulb is located correctly and embedded in the evaporator coil.
-DO not try to run the unit at 72 deg F. Raise the T'stat a couple of degrees and let the unit cycle off..

I have been working with refrigeration and A/C for over 40 years and have heard about every wives tale there is for A/C. The most common one is low Freon which is most often not the case with a hermetic (sealed) unit.

Ken
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Old 03-20-2012, 09:41 PM   #5
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I have cleaned the outer coils. I have cleaned the filter. And I am going to vacuum the inner coils. There are no leaks from outside to inside that I can see from inside or out. However I do think the temp set may have a lot to play in this problem due to the fact I am VERY HOT natured and usually have the thermo set at 70 or below. However I am almost positive that my thermo is off by at least 3 to 5 degrees. That being said I will be replacing my thermo. And adding a second ac. But any other tips or tricks will be much appreciated. And thanks so much from the bottom of my heart for the answers y'all have posted.
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