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Old 06-04-2014, 06:21 AM   #1
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Cool A/C issues

2005 Allegro Bus 40 QDP We have just completed a one month trip to The Florida Keys, and stopped by Disney on the way home for a grandkids out of school trip. As we are in a Florida summer, the A/C's have run quite a bit. In the keys, all went well, however when arriving here, they have not cycled off since we got here, and the thermostat is on 80. The front one seems to still be cold, while the back one may be a little warmer. Help! A/C not my strongest point!
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Old 06-04-2014, 06:56 AM   #2
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With the added heat load from a big front window, motorhomes can be difficult to cool. We always try to pick a site that faces north so the sun doesn't shine in through the windshield. Light-colored, outside sun screens over the windshield help, especially if the windshield faces south or west. We keep any shades tightly drawn in windows that face the sun. However, running both ACs in our 37' coach will at least keep the coach livable, even when parked without shade and with 95 outside.

To improve AC efficiency, make sure the inlet filters are clean. They can pick up a lot of dirt pretty fast when the AC is running 24/7.

If air is bypassing or has bypassed the filters in the past, the evaporator coils can also get dirty. Cleaning them is tricky because they are up inside the unit on the ceiling making them hard to reach. You also don't want to bend any of the fins if you can help it.

The condenser coils up on the roof can also collect fuzz from trees and dirt. Cleaning the condenser coils will require climbing up on the roof, removing the AC cover and spraying a gentle stream of water through the coils. If the condenser coils get dirty enough, the system will overheat and the compressor will shut down. I found that out the hard way during a spell of 95 weather in Memphis a couple of years ago. Now, I clean my condenser coils once a year.
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Old 06-04-2014, 01:18 PM   #3
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We have a 40" Phaeton with three ac's and just returned from a trip to hot and humid FL. We have found that when the humidity is high, the ac units are not as efficient as when it is lower. We take some extra steps to help the situation: Windshield cover on the windshield, door cover on the entry door window (Magneshades), night shades down on side where the sun is, clean ac return filters once a week (amazing how dirty those things get really quick when we are living in there), turn down the ac's to 69 early in the morning to head off afternoon heat then turn up to 72 later in the day (they run all day anyway), and go in and out less often if possible When we got our coach (we live in Montgomery, AL-HOT!) I put reflective thin insulation in all the cabinets against the back wall. I also added insulation to the front cap behind the tv where there was none at all. Now we are happy campers and can travel comfortably in the hottest part of summer. It still gets a little warm inside for my husband who would be comfortable at 40 degrees.
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Old 06-04-2014, 01:43 PM   #4
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Running full on might have caused coils to ice up. Try turning the back A/C to fan only for a time and then back on cool, see if it increases cool. It helps to really determine effectiveness with a thermometer you can stick in the vent, like this one:

1'' Pocket Thermometer

You can pick one up at most any hardware store.
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Old 06-05-2014, 07:39 AM   #5
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Thanks All

Thank you all very much. We had called for service, and by turning off for a while, and back on all is well again, and no need for service! Appreciste all the feedback!
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