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Old 06-19-2014, 04:20 PM   #1
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Air conditioning

Freezing
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Old 06-19-2014, 04:25 PM   #2
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Oops I was trying to search but I guess I started a thread... so my rear roof ac has frozen up a couple of times. Any ideas for a fix.
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Old 06-19-2014, 05:27 PM   #3
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Make sure you're getting enough air past the cooling coil. If you have a fan speed selector switch, run it on "high."

It's also true that being slightly low on freon can do that.
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Old 06-20-2014, 09:08 AM   #4
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This is typically an air flow problem. One solution is to always run the fan on high. Also check your air filters and ensure that they aren't dirty/clogged up. Another thing to do is to inspect your evaporator coils and make sure that they aren't caked with dust, providing a nice sponge to hold water while it freezes to the coil.

I have also found that certain brands are more inclined to freeze up than others. My Dometic Penguin has yet to freeze up, even in the most humid conditions, but I have had several Coleman ACs that gave me fits.

good luck!
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Old 06-21-2014, 07:32 AM   #5
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Low Freon and poor airflow are typical problems associated with freezing up.
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Old 06-21-2014, 01:02 PM   #6
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" Inspect your evaporator coils..." Are these the coils on the outside? I checked them and they are clear. The ones on the inside look hard to get at.
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Old 06-21-2014, 02:15 PM   #7
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Quote:
Originally Posted by BarnacleBill View Post
" Inspect your evaporator coils..." Are these the coils on the outside? I checked them and they are clear. The ones on the inside look hard to get at.

No, the condenser coils are outside. You need to inspect the evaporator coils from the inside by removing the air distribution box from the ceiling. A quick look can be had by removing the filter and grill, but that won't give you much access.
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Old 06-21-2014, 09:40 PM   #8
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After I have access to the evaporator, do you have any suggestions on how to clean it? Vacuum, compressed air... ?
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Old 06-21-2014, 09:54 PM   #9
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A can of evaporator cooler works well if you can find it.

The old style stuff is best but not easy to find, the new citrusy stuff is better than nothing.
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Old 06-22-2014, 11:08 PM   #10
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Where can I find the evaporator cooler?
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Old 06-22-2014, 11:17 PM   #11
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Lol, sorry.

I should gave typed evaporator CLEANER...

I bought a couple cans of the citrus stuff at Lowe's a little over a year ago.

I was in too big a hurry to look fir the good stuff. It worked pretty well , but I used two cans to get it clean.
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Old 06-23-2014, 05:55 PM   #12
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LOL got it, I'll check around for the " cleaner", thanks
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Old 06-23-2014, 06:45 PM   #13
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Mine freezes too. Put the temp control knob to about half and fan on high. See how that cools. One thing that helps to dial it all in is having humidity readings and temp readings. I bought one of those clocks at Sams that has both with the time of course. If the humidity goes down into the 50's or so and it is cold then just adjust the temp up leave the fan alone. I shoot for 60% and 78 degrees but it usually fluctuates.
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Old 06-23-2014, 09:37 PM   #14
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Thanks rodsterinfl, I have been turning down the temperature and letting the fan run rather than just turning the ac off.
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