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Old 09-02-2012, 08:14 PM   #1
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AC icing

I have read that in humid climate it is best not to run ac on low. Last night I noticed a drip from front ac vent. Since it was raining I was very concerned, but noticed I had set fan on low to cut down on noise and high was not needed. I set fan to high and it was not long until drip stopped yet rain continued during night. This afternoon it is very humid, fan is on high, but I am getting some drip again. Is there a fix? Is this a possible sign of low feon or possibly a clogged drain? Or both?
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Old 09-02-2012, 08:33 PM   #2
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Some brands of AC units had an icing sensor on the evaporator coils that was supposed to prevent freeze ups. Sometimes this sensor works it way loose from its mounting position causing what you are describing. If you can access your evaporator coils check to see if this may be the problem.

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Old 09-02-2012, 08:44 PM   #3
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Posts: 3,595 answer your question dirty coils or obstructions like leaves, etc. could cause your problem.
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Old 09-02-2012, 09:20 PM   #4
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Bill, it shouldn't leak inside. I think that has nothing to do with freezing.
It's humid in TX and our units are always throwing a stream of water off the roof - on low or high.

Dometics (Duo-Therm) have freeze sensors on the evaporator coil. It can be seen if you drop the cover.
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Old 09-02-2012, 11:28 PM   #5
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buck, it may not be any issue at may just be high humidity with a great working AC that is creating the vent to sweat. Is this vent a outlet vent? Is it made of metal? Metal will sweat worse than plastic vents in high humidity....but both will sweat
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Old 09-03-2012, 07:39 AM   #6
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Had a similar problem with my roof air a couple of years ago. More dripping on low fan speed less on high. Did a couple of things to stop it, cleaned the coils and unplugged the drain holes. Insects like to build nests up inside the weep holes on the Domitic units. Took a long wire tie and rodded out the holes and everything was fine after that, no dripping hope that helps.
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