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Old 08-23-2014, 08:49 AM   #1
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Cleaning coils on A/C

We have a small leak on the slide(road side) i have been up there trying to find out how it was getting in ,been doing some calking,etc..
My question is while up there i took the cover off the a/c the coils could use a cleaning.What is the best way to do this and not damage any of the a/c electric,etc. I just though about spraying some 409 let it soak then take the spray on hose and spray to the out side? How does everyone else do this.
Also has anyone had a leak from condensation been coming in right at the slide though the light is were i saw the water dripping. I set the m/h off level so it would dry out then calked with silicone right above were the slide awing is.Wait tell it dries and see. There is no water on the slide it self??
Thanks
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Old 08-23-2014, 08:56 AM   #2
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Check out A/C coil cleaner at Home Depot--designed for outside residential units but fine for RVs too----$5-7....one can will do.....Outside condensor coil is the most likely target--once treated with cleaner, spray water outward....the inside coil [evap] can get dirty too----inside air from coach...a bit harder to spray and contain the water but still easily done....
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Old 08-23-2014, 09:49 AM   #3
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I used "Goodstuff" coil cleaner, it worked well but is a little pricey. I put a folded towel into the opening to the coach and it was easy to keep water from getting inside. Apparently other cleaners are safe to use also....
My earlier post is here: Air Conditioner coil cleaning
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Old 08-23-2014, 10:15 AM   #4
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I use compressed air from a small compressor the I have. If you do this, just make sure that you reduce the air pressure at the regulator or not get so close the you damage the fins by the high pressure air. Blow the air though the coils from the inside out.

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Old 08-23-2014, 11:31 AM   #5
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IN the past I have just used water.. However last time, Compressed air.

Coil cleaner is good too..

Most of the wiring is fairly immune to soaking provided the power is OFF when you go up there.
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Old 08-23-2014, 11:36 AM   #6
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I used the foam stuff from Home Depot on the coach and the house AC's.

Works fine.
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Old 08-23-2014, 12:21 PM   #7
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Funny just did mine an hour ago with AC coil cleaner from
Lowes, looks a lot better
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Old 08-23-2014, 01:40 PM   #8
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I recently, read a post on here, that said to only use water, because coil cleaning liquids can/will prematurely, rust the pan, under the coils. Can anyone verify that?
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Old 08-23-2014, 01:52 PM   #9
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Typically you should use just water. Use a sprayer and wash the coil out opposite of the air flow. This will flush all dirt out of the coil.

Cover the condenser fan with a plastic bag to protect it from getting soaked.

Also be careful with high pressure water sprayer as it will damage the fins on the condenser coil.
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Old 08-23-2014, 01:53 PM   #10
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Quote:
Originally Posted by gripper View Post
I recently, read a post on here, that said to only use water, because coil cleaning liquids can/will prematurely, rust the pan, under the coils. Can anyone verify that?

I just use some Dawn in water and a garden pump sprayer ... then rinse with plain water. I don't want to deal with chemicals running down the RV sides.
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Old 08-23-2014, 02:29 PM   #11
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Quote:
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I recently, read a post on here, that said to only use water, because coil cleaning liquids can/will prematurely, rust the pan, under the coils. Can anyone verify that?

Cannot confirm. Both are 19+ years old and still on the roof working fine with a 24 degree drop to ambient.
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Old 08-23-2014, 04:16 PM   #12
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Quote:
Originally Posted by golfpgb View Post
Typically you should use just water. Use a sprayer and wash the coil out opposite of the air flow. This will flush all dirt out of the coil.

Cover the condenser fan with a plastic bag to protect it from getting soaked.

Also be careful with high pressure water sprayer as it will damage the fins on the condenser coil.
X2

Had a problem several years ago with the AC repeatedly tripping the breaker. It turned out to be because the compressor was overheating due to dirty coils. This is exactly how the AC service guy cleaned all the cottonwood fuzz out of my coils, except he didn't bother with the plastic bag. It's the way I now clean them myself every year or two - just use gentle flow from a garden hose in the direction opposite the air flow.

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Old 08-23-2014, 04:35 PM   #13
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It would be a good idea to have a fin comb that you can get at most auto parts stores. That allows you to straighten the fins that have been bent during hosing or cleaning.
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Old 08-23-2014, 04:52 PM   #14
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Agree with Fin Comb.. Have always used water and a brush in the past. Last time I tried compressed air... That worked great,, It is how Ill do it from now on.. I have all the compressed air I can compress.
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