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Old 01-26-2012, 10:10 AM   #1
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A/C mildew smell

If the a/c unit is shut off for 12 hours after running there is a mildew odor when the blower starts up. The drain is open and dripping very nicely. Is there something that can be acessed and cleaned to remove the smell?
I've cleaned the filter inserts and they are not the culprit.
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Old 01-26-2012, 11:29 AM   #2
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When the AC runs it produces condensation in the collection tray that drains out through the tube in the roadside wheel well. There is a tray in the unit that will hold water - it will grow mold over time - especially in humid areas where the water will not evaporate or drain off. That mold will build up also and may block the drain tube. A few drops of bleach in the tray will kill the mold. Carefull, if it dies in sheets it can block the drain tube. I have also heard of people putting fish tank alge tablets in there that will do the trick but bleach has always worked for me.
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Old 01-26-2012, 11:35 AM   #3
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At many auto stores there is a spray product that can be sprayed into the air input side of automobile AC systems and is said to reduce or eliminate odors. It should work on your rooftop unit. Look in the chemical section of your auto store and/or ask them if they have such a product. It is not available everywhere. I have some at home, but not there right now so I cannot give you a specific name.
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Old 01-26-2012, 12:14 PM   #4
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You may want to try an EPA-approved funcigidal product called MoldSTAT HVAC, which is made specifically for air conditioners. A/C mold was tracked as the source for Legionaire's Disease, so prompt action to kill the mold is definitely prudent. Not all mold in an A/C unit will produce the disease; there are so many different types of mold out there, but better safe than sorry.
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Old 01-26-2012, 12:21 PM   #5
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Is Your AC Making You Sick - AC and Mold - Portable AC Solution
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Old 01-26-2012, 12:46 PM   #6
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One thing you might try is running it on fan only for the last 5 or 10 minutes of the day. It may dry out the evaporator enough where there will be no smell at the next startup.
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Old 01-27-2012, 10:23 AM   #7
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Thanks everybody, I have to get something up in there just to be safe, not fond of bleach, caustic to a/c parts, someone recommended Spray 9
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Old 01-27-2012, 10:57 AM   #8
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Quote:
Originally Posted by arcamedies View Post
Thanks everybody, I have to get something up in there just to be safe, not fond of bleach, caustic to a/c parts, someone recommended Spray 9
A drop or two........
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