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Old 06-26-2012, 01:50 AM   #1
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House AC Not Cooling When Running Gen.

Boy it's hot! Having trouble with AC units on 2010 Phaeton, especially the rear unit while traveling. Of course using the 8K generator, but the units don't seem to keep the coach cool. We're running the front ac and both house units and still the inside temperature reads 99 degree in the back bedroom and 92 in living area. Everyone is crowded around the dash ac looking for relief.
After arriving at campground and hookup to shore power the units seem to work much better.

Visited Red Bay last October when temps were milder but techs could not find and problems. Hopefully someone here has suggestions.
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Old 06-26-2012, 05:26 AM   #2
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Do you feel cold air coming out of the A/C units? When serviced, did they check the freon charge in the units? Also, the better performance when plugged into shore power might indicate that the electrical load on the generator when it is running the A/C units is too high. Have you tried it with two of the units on instead of all three?
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Old 06-26-2012, 07:02 AM   #3
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any of your roof vents open?
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Old 06-26-2012, 12:26 PM   #4
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Since they are both running:

Start by cleaning the filters, while you have the filters out inspect the evaporator coils (Visual inspection)

now go topside, pull both the outer shroud and the inner covers and clean the condenser coils, fan, evaporator (if they need it) and anything else that looks like it needs cleaning.

I did that a couple years ago and was AMAZED at the improvement.. I now do it more often.
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Old 06-26-2012, 03:07 PM   #5
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All the roof vents are closed. This spring I purchased foam inserts to block the sun light from entering through the roof vents. We pull down all the curtains to block as much sunlight as possible. The air coming from the AC vents is cool at best. It seems the front unit is providing the cooling. At some point I have to assume the rear unit stops working, but still blows air. Both units are blowing into one duct system which run the length of the coach. Red Bay checked refrigerate levels and electrical system. But now that I think about it, they may have checked the system while on shore power. I wasn't in the service dept. to know for sure.
I have an appointment to have the side rails replaced in October, but once again the weather will be cooler and more difficult for them to isolate.
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Old 06-26-2012, 03:29 PM   #6
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2 suggestions. Because it happens at speed, I'm guessing #2. First check AC power from the gen. If your voltage is way off the motors won't run properly, whereas shore power should be fairly reliable. Likely gen is OK, but better check.
Second, and way more likely, the AC roof units come w/a reallllllly cheap ~1" square foam sealer of the plastic top to the coils & air box. the foam had peel-&-stick to place it on the underside of the plastic top. Whoever placed the foam missed the mark by a lot. The coils were not sealed, so hot air could recirculate within the lid and back into the already hot inside of the coils. The airbox which is supposed to be cold was not very because of recirculating hot air not contained as it was designed by the strip of foam.

If #2 is the story, head to H.D. or Lowes & get some 1/2"x1" or wider stick on foam, comes in rolls. Peel of the lousy OEM foam & toss it. Carefully map out the proper path of foam seal, you may need two layers. I did two strips sided by side, then a single layer on top of the two in a short pyramid arrangement. Seal the lid to the top of coils, seal the cold air box similarly to the lid. I did this one AC w/out telling DW. First trip out she said, "What did you do the the air conditioner, its working great!!" Proudly, I told her the story. Her reply: "Well go do the other one right now!!!" Its nice when you get credit for initiative, don'tcha think?
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Old 06-26-2012, 04:21 PM   #7
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What color is your coach? If black or a dark color, it's an uphill struggle.

fred
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Old 06-26-2012, 04:43 PM   #8
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since you have the ducted system- do you have the option of having the air dump directly down from the grill? There is a little tab that open the louvers.
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Old 06-26-2012, 08:09 PM   #9
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Thanks folks for all your input. Engineermike, I hope the fix is this simple. Will inspect foam this evening or in the morning. But wouldn't this also be a problem when connected to shore power?

Fred and Bonnie, the color is dark and light brown. A real heat absorber.
Ernie, I don't have direct excess for air dump.

Thanks
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