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Old 06-19-2011, 02:05 PM   #1
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AC System Help

Hello,

Had a great Father's Day weekend trying out an RV spot at the local KOA here and loved it.

However, I am a little worried I might have a serious problem with my AC unit. Hoping it is nothing major, because money is a little tight right now. Hope someone here can give me an idea what I am looking at.

When I hooked up the electrical to the pole I went in and turned on the AC. There was a sound like there was a plastic bag slapping around coming from the Roof top AC. So I climbed up to investigate and found a leaf in there and pulled it out.

Later on yesterday I noticed a bit of water dripping down the passenger side of the rig. It was coming from the rooftop AC unit. It was really humid, so I thought maybe it was just condensation.

However this morning a steady, but small stream of water came into the rig. It was coming from the cover for the air filter for the AC unit.

My motor home is a 1985 Mallard Class C. It has a Duo-Therm Brisk Air Unit that according to the serial number I gave to the place I ordered the new shroud it is an old style unit (Pre-2000 manufacture date). A couple weeks ago my Dad and I put a new shroud on the unit becuase the old one was broken up on top.

What do I need to look for to repair this issue? Could it just be a condensation drain is plugged somewhere?

Need to get this repaired before the Fourth of July weekend.
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Old 06-19-2011, 02:21 PM   #2
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The evaporator coil runs a lot of moisture off of it in humid weather. There is a drain to get the water from the pan on to the roof. if it is plugged, the water can run inside. Another problem is the gasket between the unit and the roof. It can work loose and leak. Try tightening the 4 bolts from the inside...no more than about 8 ft-lbs of torque.

if tightening does not work, you will need to replace the gasket....Do not use caulk.

ken
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Old 06-19-2011, 02:38 PM   #3
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There is a plastic tray under the cooling coils, it is supposed to catch the condensation. these are problematic. They can crack and allow the water to drain inside rather than outside.
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Old 06-20-2011, 07:12 PM   #4
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Thanks for the replies. I appreciate it. I will take a look at it this weekend. Too stormy out until then for me to justify tearing into it. Hope it is something simple.
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Old 06-28-2011, 09:20 PM   #5
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While your up there you might consider taking the time to clean the evaporator coils - they are located under the metal housing (lots of screws holding it down but no big deal to remove). When I clean those coils I put a towel in the air shaft leading inside the rig and soak the coils with Simple Green -- then I gently spray the coils with a hose and wash down the area. If you haven't cleaned the coils before you maybe surprised how nasty those coils look and be pleasantly surprised at the performance boost to the AC unit.
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Old 07-01-2011, 11:32 PM   #6
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Quote:
Originally Posted by ksg5000 View Post
While your up there you might consider taking the time to clean the evaporator coils - they are located under the metal housing (lots of screws holding it down but no big deal to remove). When I clean those coils I put a towel in the air shaft leading inside the rig and soak the coils with Simple Green -- then I gently spray the coils with a hose and wash down the area. If you haven't cleaned the coils before you maybe surprised how nasty those coils look and be pleasantly surprised at the performance boost to the AC unit.
Thanks for the tip. I am going to check it out when we get back from the reunion. I'm sad we're not taking the motor home to the reunion (been planning that since we got it), but I have not had time to look at it. Been taking classes. Just finished 9 college credits in 3 weeks. Did not have time for anything else really.
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Old 07-22-2011, 06:27 AM   #7
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Well the issue was definitely loose mounting bolts. On the corner where the drip came through the filter for the AC unit the bolt was about 2 inches too loose. I could not believe it. The seal still looked pretty good. I think I would like to replace it next year as I have not idea how old it is. It isn't cracked and still has some pliability, so I think it is still good.

I did not clean the coils. I'll have to access them from the top. Wish I'd have done that when I replaced the scroud. Oh well. Live and learn.
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