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Evaporator
I have some moisture underneath my Galley evaporator. I can hear the sound of a little water coming from the evaporator, like a gurgling sound, but it still works and blows cold.
Anyone have this type of issue and what to do to eliminate the excess moisture?
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16 Replies
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An evaporator is always going to have moisture because its temperature is colder than the air passing through it so the humidity in the air condenses on the evaporator and typically drips into a tray below the evaporator. The tray will have a drain so the collected moisture can drip on the ground outside.
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Well I don’t have that gurgling sound in my three other evaporators. Also, I have some moisture on the floor under my Galley evaporator, which I don’t believe should be wet.
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Tim,
This is just a WAG, but could the hose from the drain pan be plugged up, cracked or broken? On our coach, the drain lines all run to a location outside where you can see the water drain and collect on the ground. Do you know where the drain line for that unit is? If so maybe a blast of air from the bottom would clear the blockage. Assuming that what the problem is.
Hopefully someone with more knowledge will jump in with the correct anser.
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Tim,
Look at your drain hose underneath the bus for that evaporator, if it’s not dripping, like Andre said, the drain line could be plugged. Not unusual with dust & dirt to clog the drain. If you can get your air hose to it, blow air up to the evaporator fro under the bus to see if it’s plugged.
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You might also consider using a shop vac to suck it clear, pulling the gunk out instead of blowing it back into the unit.
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Great ideas!
Will do tomorrow…
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Tim,
Also some AC sytems make noise. Your refirgerant in the evaporator is trying to boil. It is pulling heat from the air through the evaporator coils to accomplish that and that is what drops the temp in the evaporator coil so the air passing through it is cool. As it turns the refrigerant into a gas from a hot liquid refrigerant you might hear a gurgling sound.
The advice you got about a potential blockage in the drain pan is good advice
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So this morning I looked underneath my coach. I may have this wrong, but the attached picture is the only drip line for my evaporators. It definitely was the one for the galley AC evaporator.
It’s upside-down, so if one of the Admin could turn it right-side up, that would be great.
Because I low-leveled my coach, this line was pushed into the ground not allowing water to escape. When I wiggled the line free, about a quart of water came out of the line.
I’m thinking this is the main line out for all four of my evaporators and that they come thru the galley AC evaporator, hose/pan, which is why the water was backing up into that unit.
Does this sound right to Marathon owners?
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OK Tim, I rotated this one with my IPad, so tighten up big boy, I just recently posted how to fix the picture orientation and you can expect a huge increase in dues.
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Tim, what you said about so much water coming out would explain the problem initially described. A quart of water is a lot so it could have backed up.
That assumes all evaporator drain pans share a common outlet. To me that doesn’t make sense because the evaporators likely have some distance between them so from a manufacturing perspective it is just easier to drain each one individually.
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On most Marathons running 4 roof airs the Salon and Bedroom have their own drain plugs and the hallway/bath and galley share one drain.
Later
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Tim I have 3 cruise air’s and each has it own drain line. 1 up front, one in the middle of the coach and 1 towards the rear. Hope this helps.
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Me to, all 4 cruiseairs have a separate drain. But, all of Tim’s cruiseairs are in a single bay, so maybe they share the drain.
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All four evaporators would not be in the same place would they? I can’t see how that would work very well. Since the drains come off of the evaporators, I don’t see how they could all be tied together….no way that would work right.
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They could be tied into a common drain, but the lengths of tubing and fittings would make it impractical. The large volume of water Tim drained suggest more than one might share a drain, but likely the large amount drained could also be the one drained is the evaporator used most frequently and it has been used in a high humidity environment.
At times my evaporators put a lot of water onto the ground.
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