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Bad smell from boat AC

Old 11-25-2020, 02:11 PM
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Default Bad smell from boat AC

Ok,We have a pretty bad smell blowing through the vents from the boats AC.It's kind of sulfur sewage type odor.We plugged all ports to the black tank and unplugged and cleaned the fridge to eliminate those 2 possible culprits. ( I hope )
The AC is located in a hatch just in front of the helm.We did notice some moisture in the hatch and poured in some bleach.We then could smell the bleach coming through the vents and thought we may have solved the problem.The smell came back.The only thing in the hatch are some boat covers. ( no mold )
Could it be something inside the AC ? Kind of at wits end on this. The boats a 2011 and recently acquired.There was no smell on inspection, prior.Thanks, Lu.
Old 11-25-2020, 02:26 PM
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I don't know, but I found this book invaluable:
Get Rid of Boat Odors Get Rid of Boat Odors
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Old 11-25-2020, 02:41 PM
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Try taking the covers out and see what happens. Most likely the smell is in the covers
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Old 11-25-2020, 02:44 PM
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Default Smell

Could be dirty sock syndrome.
Old 11-25-2020, 02:49 PM
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What type of air filtration is it using? Could be molded or just really dirty. I agree with the other post. Take everything out that is in there with it an run the unit for a while. If it doesn't clear you know where to further investigate.

Might also run the unit at full blast with all the hatches open and spray a can of Lysol Neutra Air into the air intake. Might take a few applications of this to kill all the mold and bacteria that is in the system and duckwork. Keep the cabin well ventilated until all the disinfectant is vented out.

Last edited by Rollo Tomassi; 11-25-2020 at 03:10 PM.
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Old 11-25-2020, 03:28 PM
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Thank you everyone.Will try anything at this point!!
Old 11-25-2020, 03:36 PM
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Could it be the water in the AC pan? Like when your water tank water goes bad? PU!!
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Old 11-25-2020, 04:25 PM
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do you have salt water flush heads? the incoming water will smell bad after sitting for a while
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Old 11-25-2020, 04:47 PM
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Follow the path of air. You may have water/ mold trapped in the vents. The ac is air in/ air out.
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Old 11-25-2020, 05:26 PM
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Thanks again to everyone,
Old 11-25-2020, 06:08 PM
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Originally Posted by Lu 1967 View Post
Ok,We have a pretty bad smell blowing through the vents from the boats AC.It's kind of sulfur sewage type odor.We plugged all ports to the black tank and unplugged and cleaned the fridge to eliminate those 2 possible culprits. ( I hope )
The AC is located in a hatch just in front of the helm.We did notice some moisture in the hatch and poured in some bleach.We then could smell the bleach coming through the vents and thought we may have solved the problem.The smell came back.The only thing in the hatch are some boat covers. ( no mold )
Could it be something inside the AC ? Kind of at wits end on this. The boats a 2011 and recently acquired.There was no smell on inspection, prior.Thanks, Lu.
first, pouring bleach somewhere random is not wise

second, plugging a black tank, you never want to completely plug, they need to vent. you should be able to easily tell if the smell is coming from the holding tank. make sure all fittings and connections are good, no cracks, and waste hoses have been replaced

third, dont only clean the fridge, put baking soda inside of it

fourth, it could be mold or something in the ac system. get a scope camera and send it on in. you may have to rip out all the vent hoses if that is the case. breathing mold is very bad.

fifth, sulfur could mean batteries. have you checked all of them? are they new? if wet cell, have you been maintaining them with distilled water? take a heat gun to them make sure none are overheating.
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Old 11-25-2020, 06:55 PM
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Check out bg fridgy fresh it's used in car ac coils that stink
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Old 11-25-2020, 08:49 PM
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Do you have access to open up the ac unit and clean it’s parts,bio fresh after a good cleaning
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Old 11-26-2020, 12:40 AM
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Thanks once again for everyone taking the time with this headache.

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