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Old 05-23-2015, 06:08 PM   #1
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AC condensation

My old 1988 Holiday Rambler class c just started dripping water from the roof ac on the interior out of the plastic cover where the adjustable vents are. I don't see any water draining off the side like it usually does. Is there a drain tube somewhere that could be stopped up or does that mean the seal on the roof is bad?
Thanks
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Old 05-23-2015, 06:21 PM   #2
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You'll have to pull the top cover off the roof unit and check the drain pan and the holes that allow the pan to drain , the plastic catch tray can accumulate dust and that stops up the drain allowing water to overflow inside. You'll need a thin flat blade screwdriver and Q tips to clear the drain, cover is usually Phillips screws, 5/16 & 1/4" nut drivers possible too.
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Old 05-23-2015, 06:28 PM   #3
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While you're up there with the shroud off, be prepared to clean the fins on condenser and evaporator (should be done annually). Straighten any bent fins and replace any missing screws. Your air conditioner will thank you.
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Old 05-23-2015, 06:45 PM   #4
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Thanks for the replies i will do that. It has always dripped the water off the side until this trip. I first noticed it turning corner. The water had leaked and ran to a cabinet and dripped out when i turned. After cleaning it up I saw the source dripping from the plastic cover. It was dripping right on my wife's computer.
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Old 05-24-2015, 01:53 PM   #5
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Zoom,

A lot of people miss this one, but there is an inlet filter on all the roof A/Cs, and when it gets dirty, the inside air fan has to suck so hard that the drains for the condensate don't drain and the condensate goes inside.

So, check that before you go up on the roof. But if you have not, plan on going up on the roof to clean the unit anyway. Take fully charged power phillips screw driver with you.

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Old 05-24-2015, 02:42 PM   #6
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On SOME RV's there is indeed a drain tube..Not all. However if it cloggs it should run off the roof.

ON all there is a drip lip on the condensation/evaporation tray it can clog (More on that tray later) as can passages water flows through.

Clogged (dirty) intake filters can cause a build up of vacuum in the intake area and this can suck water out of said tray into the intake area where eventually it falls.. I run my fans on HIGH constant not auto and when I stop them.. NIAGARA time.. Last time though i heard telltale noise (Gurgling) and cleaned 'em before Niagara time. (About 3 days ago).

Ice build up (if it is icing) can do it too.

So can leaks

Clean the intake,, Pop the top (Remove cover) Remove inner covers CLEAN EVERYTHING (Evaporator.. Condensor,, Fan/Blower.. Water passages,,Anything else that looks important)

IF (not very likely) IF there are lubrication ports..Lubricate (Do not look too hard odds are there are none) and re-cover.

Option 2:
ON my A/Cs one the drip lip is on the rear.. Other it is driver's side

If the coach is low in front or low on curb side.. The lip can be higher than the inside end of the drip.evap tray.

Why is it called a drip/evaporation tray

Water drops off on the evaporator into the drip end.. flows to the rear where the condenser (HoT COILS) are and there aids in cooling, evaporating at the same time.. TOO MUCH water drips, and the excess flows out and either onto the roof or into a funnel and down a tube.
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Old 05-25-2015, 06:56 AM   #7
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I cheked everything you said. I didnt see drain tubes but there are several holes in the pan that were clogged with dirt. I cleaned the interior filters. I took the covera off and the evaporator was iced up on the bottom. I blew out the condensor and evapoator and sprayed ac coil cleaner on them. It didn't foam up like it use to though. I put it all back together. and it still doesnt seem to cool like it use to so i may try cleaning it again and get some aluminum ac tape and make sure all the seams are sealed good. Thanks for the replies.
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Old 05-25-2015, 08:27 AM   #8
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Did you clean the CONDENSER coils as well as the Evaporator?

Iceing is caused by one of several things.

ONE is loss of refrigerant,,Which will also cause loss of cooling.

Some of the others you have already addressed (Dirty filters for example)
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Old 05-25-2015, 01:59 PM   #9
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Have you been running the AC with the fan on low? If so, this can cause icing, and of course with icing you get lower efficiency. Allow time to let any ice melt off, and then try running the AC on high only.
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Old 05-26-2015, 08:21 AM   #10
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I normally run it on high but it seems to cool better on low right now after cleaning everything. I think it may be a little low on freon. It has a charge fitting install on the low side line. I cracked the dust cap and freon started to come out. I guess it has a bad valve under the cap which has allowed some freon to seep out over time. The compressor runs continuous but it will kick off if I adjust the thermostat to a lower than max cool setting.
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