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04-08-2023, 03:33 PM
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#1
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Junior Member
Join Date: Apr 2023
Location: Estero, FL
Posts: 4
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A/C stains
I am getting rust colored stains from my roof A/Cs. Suspect it is iron bacteria but not sure. Is there a solution to this problem?
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04-08-2023, 06:50 PM
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#2
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Senior Member
Join Date: Jul 2005
Posts: 5,996
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Welcome aboard! 
Have you been up on the roof? Had the cover off the AC unit? While the evaporator tray may be rusting out on an aged unit, the condensation may be picking up color from leaves, pollen, dust, or anything else trapped on the roof or in the gutters.
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TandW
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04-08-2023, 06:58 PM
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#3
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Senior Member
Join Date: May 2021
Location: Brenham, Texas
Posts: 2,287
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Quote:
Originally Posted by Chiporum
I am getting rust colored stains from my roof A/Cs. Suspect it is iron bacteria but not sure. Is there a solution to this problem?
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I do believe that the rust will be impossible to stop unless you can eliminate its source. New ac units will eliminate the problem but any other fix will produce only temporary results. Of course, someone else may have a solution to help you. We’ll see.
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Eddie and Jomaye, Retired
2018 Newmar Ventana 4369
2021 Jeep 4 dr Wrangler
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04-08-2023, 07:14 PM
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#4
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Senior Member
Winnebago Owners Club Fleetwood Owners Club Holiday Rambler Owners Club
Join Date: Dec 2011
Location: North East Florida
Posts: 2,028
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There are several products that will remove rust stains. Iron Out always worked well on my fiberglass boats.
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2019 Horizon 42Q
Cummins L-9 450 HP
Maxum Chassis / IFS with Tag
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04-08-2023, 07:21 PM
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#5
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Senior Member
Join Date: Jul 2005
Posts: 5,996
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Naval Jelly, oxalic acid, and lemon juice are all good rust removers also. Rinse with a lot of water and rewax the affected area right away.
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TandW
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04-09-2023, 06:28 AM
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#6
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Junior Member
Join Date: Apr 2023
Location: Estero, FL
Posts: 4
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Coach is new (2023). Have not yet had cover off as I didn’t think rusting would be an issue. Read about iron bacteria but not sure if that is what I have.
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04-09-2023, 06:39 AM
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#7
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Senior Member
Join Date: Jul 2005
Posts: 5,996
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How close are you to the sea breezes there in Florida? It is more than likely the salt air is the agent rather than iron bacteria, an agent often mentioned more with well water. You need to get on the roof and apply lacquer to the rusty hardware when you find it.
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TandW
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04-09-2023, 06:41 AM
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#8
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Senior Member
Join Date: Jul 2017
Location: on the road / Frostproof
Posts: 292
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Take in to dealer if under warrenty and have them check it out . Could be a roof leak around A/C cutout or backup in drain line .
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Jim 2016 Forza 34 T 2014 Honda CRV
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04-09-2023, 08:12 AM
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#9
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Junior Member
Join Date: Apr 2023
Location: Estero, FL
Posts: 4
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Have warranty appointment May 1. Thanks to all for input. I’m new to this.
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04-10-2023, 10:37 PM
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#10
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Senior Member
Join Date: Apr 2018
Posts: 3,441
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The acs are condensing water out of the air. It shouldn’t have iron in it unless you’re parked near some chemical plant pumping it into the air. I would think it is wash water .
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2004 Dynasty 4
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04-11-2023, 07:40 AM
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#11
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Senior Member
Join Date: May 2021
Location: Brenham, Texas
Posts: 2,287
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Quote:
Originally Posted by Chiporum
Coach is new (2023). Have not yet had cover off as I didn’t think rusting would be an issue. Read about iron bacteria but not sure if that is what I have.
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I hadn’t read your profile so I didn’t know your coach was new. No idea but personally, I agree with another in that I’d call whoever you purchased it from or the ac manufacturer to get some ideas. Let them take a look at it. Good luck.
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Eddie and Jomaye, Retired
2018 Newmar Ventana 4369
2021 Jeep 4 dr Wrangler
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05-02-2023, 11:59 AM
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#12
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Junior Member
Join Date: Apr 2023
Location: Estero, FL
Posts: 4
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No word from dealer yet. Attached is photo of condensation stain.
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Chip
2023 Newmar Bay Star Sport 2920
2014 Mini 2Dr Hardtop
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