A/C freezing: this is a pickle

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  #1  
Old 05-21-19, 09:24 AM
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A/C freezing: this is a pickle

My AC is freezing over. It does so in 15 to 30 minutes. The freezing goes from my basement out to my outdoor unit, though to a lesser degree as it goes outside. I am nearly certain I have plenty of coolant and my filter is clean. The third picture is the outside unit and you can see how the it has condensation on it.

What are your thoughts questions suggestions?

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Last edited by PJmax; 05-21-19 at 10:08 AM. Reason: resized pictures
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Old 05-21-19, 10:03 AM
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Oh, I forgot to mention that when I shut off my ac I went back downstairs to check out the unit. When I got there the furnace shut off and a stream of water poured out the condensation line right when it shut off. That seemed odd to me.
 
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Old 05-21-19, 10:10 AM
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Welcome to the forums.

Your evaporator coil is icing over. That's where all that condensate came from when it melted.

Poor airflow and low refrigerant are the two causes of your problem.
You can't guess if the charge is correct. It needs to be checked with gauges.
 
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Old 05-21-19, 10:18 AM
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Thank you Pete. I should have added that I had an AC repair man here last summer who charged us up and put the fluid in to show where leaks are coming from. He came back about 2 months later and checked and saw the leak was minor and not an issue. His gauge showed we were still at full. Since it was fully charged last summer and it was checked for leaks I feel it isn't likely to be low refrigerant.
 
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Old 05-21-19, 10:19 AM
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You may be surprised how fast the refrigerant can leak out.
As I mentioned.... there are only two possibilities. If it's not one.... it's the other.
 
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Old 05-21-19, 10:23 AM
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Could clogged duct work be a cause?
 
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Old 05-21-19, 11:33 AM
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If it was low on refrigerant last summer, it’s likely low again.
If you have a leak and know where it is I’d suggest fixing it.
I’ve never known ductwork to get “clogged”.
 
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Old 05-21-19, 11:58 AM
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New photos

I wanted to do some more checking to see if I could discover the error. I opened up the A coil to look at the inside and found it looking pretty dirty to me. I am going to clean it up but I'm hoping someone might know if this is really bad? Bad enough to be causing the freeze to occur. Check out the photos and tell me what you think please.

Oh, also any advice on how to clean it effectively or for anything to avoid doing to it.

THANKS

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Last edited by PJmax; 05-21-19 at 05:17 PM. Reason: resized pictures
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Old 05-21-19, 05:21 PM
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The first two pictures are the "air out" side of the coil. That side is always clean.
The air enters the bottom of the coil and that coil is extremely dirty. If it was dry you could carefully vacuum a lot of it out. I have a feeling you're going to need a can or two of coil cleaner spray. The home improvement stores sell it.

You can spray the dirty side of the coil but you need to rinse it out from the clean side. Make sure the condensate line is clean. Be gentle.... you don't want to bend the fins.
 
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Old 05-21-19, 05:59 PM
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Thank you Pete that is very good news for me to have. I didn't realize I needed to be gentle. I will pick up a couple cans of coil cleaner spray and work on it tomorrow. I will update when I get it all done and turn it back on to see if it works?
 
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Old 05-21-19, 06:24 PM
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Gentle on the fins. They bend very easily and can be hard to straighten back out.
 
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Old 05-22-19, 08:23 AM
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I picked up some Nyco AC coil and fin cleaner. It is the only thing the local hardware store had. I'm concerned it may not be fit for use on my A coil since it doesn't refer to it. It does mention your outside and window units being cleaned with it. Do you know if it is ok to us? Here is a link to the product on Amazon. https://www.amazon.com/Cleaner-Air-C...sr=1-2-catcorr
 
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Old 05-22-19, 09:06 AM
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and saw the leak was minor
There should be no leak, a minor leak over a long enough time means the system is likely low!
 
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Old 05-22-19, 03:09 PM
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I couldn't find any AC cleaner at the 4 locations I went to. Sooo, I just cleaned it best I could and put it all back together and my AC now works. Will order some AC cleaner online and work on it in a few day. Thanks for the assistance.
 
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Old 05-22-19, 10:57 PM
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That cleaner is fine for your coil. It's just a generic coil cleaner. They don't list every application.
Just spray it on heavy. Let it soak for a while and using a hose and fresh water rinse from the clean side towards the dirty side.
 
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Old 05-23-19, 09:04 AM
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Thanks, someone at Lowes told me it was different and much more potent than what I would use for inside the A coil. But unfortunately they were out of stock on it.
 
 

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