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Old 06-23-2009, 09:26 PM   #1
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How cool does your airstream get when it is 95 out

How well does you airconditioner work when it is 95+ degrees out? Does it keep it really cool, comfortable, OK, a little warm? I had a friend checking out my airconditioner when it was blazing hot out and he said his motor home stays very cool until it gets really hot out and then it can get a little warm in there. He feels my air is working fine.

I have a 27' with a 15000 BTU airconditioner.

How well does your air work.

Brian
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Old 06-23-2009, 09:33 PM   #2
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If I'm in blazing sun, don't open the door, shades shut...the AC runs 100% and keeps things, well, um, tolerable. Then there's the Humidity...If the dehumidifier doesn't ice up, it does free up the AC to cool the air instead of wringing water out.
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Old 06-23-2009, 09:35 PM   #3
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I have to dump the ice out every few hours

Best thing I ever did was to replace the freon.
Drained it all out and reloaded the correct amount of fresh.
Sounds crazy, but it worked.
AC friend told me freon loses some form of ingreadiants.
All I know is the temp coming out is now much lower on my 1989 units
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Old 06-23-2009, 09:37 PM   #4
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On our trip to New Mexico and Arizona, we got the chance to try out the AC again this year, it didn't take long until it was cooled down nicely in the 95 degree heat, it works great. We have used it here in Missouri in the heat and humidity we have, and have had no problem with it.
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Old 06-23-2009, 10:43 PM   #5
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Hey Klattu

Do you have Coleman Mark V on your rig? That's what came on my '89 345. I think it's about time for a charge too. Were you able to convert to R134A or just lucky enough to find some old good stuff (R12)?

Ricky
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Old 06-23-2009, 11:24 PM   #6
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Mine is a Coleman and it was built in 76. It will blow cold air but when it gets really hot like today (mid 90's). It just makes it cool enough so I can tolerate it. It does not have a valve on it to recharge, but I spoke with a person who has an airstream who had a friend who works with airconditioning sweat a valve on his and recharge it with R12. He said it is blowing very cold air now. I have not found anybody who wants that job because of having to capture the old and put in the new. I understand the importance of not letting that stuff loose.

Brian
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Old 06-23-2009, 11:37 PM   #7
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3.d.n.

I changed over to the new stuff.
(yes I remember seeing R12 at K-mart for $1 a can, and passing it up)

Mark V...yes...two of them.
I got up there just to look them over, see how tough to replace.
But when I took the cover off, and saw how much better they were built than whats available today, iI decided to keep them.

When recharging, be aware of temps coming out of air ducts.
Just a few ounces too much, and it warms up...not down.
And it happens fast.
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Old 06-23-2009, 11:46 PM   #8
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Brian,

Check out this thread regarding A/C recharging:

http://www.airforums.com/forums/f427/1971-overlander-ac-unit-42846.html

Ours was the original Armstrong and had the same problem, so we decided to just go for it and bought the new Carrier AirV 15,000 btu unit. We'll be installing it next weekend. Overlander63 (Terry) is coming over and we're having a A/C swapping party-BBQ on July4th. Theirs needs a new one too.

We found the best price on these units for us being in Calif. was from FamilyRV (727-389-3440-talk to Ted), They sell on Ebay, or you can call them directly which they prefer and will throw in free shipping insurance. The cost for this unit all parts included (main unit, inside ceiling panel, ext. gasket kit,shroud) was $589, including shipping. They are in Florida, maybe you are close enough to go and pick up if you buy from them.


Good luck with whatever you choose.

Mary
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Old 06-24-2009, 06:49 AM   #9
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We have taken several steps to increase the cooling efficiency....

1. Streetside and rear awnings - it is AMAZING how much these help.
2. Bought reflective bubble wrap and cut to fit skylight openings and Fantastic Fan openings. The amount of heat that gets in those 4 openings from the sun (even with the skylights closed) is tremendous.
3. Clean the filter mesh on the AC regularly - it's amazing how much dust that thing accumulates.
4. Close the vents in the shower and the bath when not in use.
5. Keep the curtains closed when the sun is shining in those particular windows.

These five things have made a huge difference!
Best of luck!
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Old 06-24-2009, 07:55 AM   #10
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My unit keeps an interior temp where I could hang meat in the trailer at the temps questioned above, in full sun.

I have been very interested in refrigerant out there that replaces R-12 and in fact can replace R-134a. There are two companies that make the stuff, it's called Duracool R-12a:

Duracool«.com 2004 - Duracool« is The Recognized Leader In Hydrocarbon Refrigerant Technology


I am not considering doing this to the Safari since it works very well, however my truck A/C appears to be failing and I have been considering replacing my 134a with this stuff.
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Old 06-24-2009, 08:16 AM   #11
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FWIW, on my '63 Overlander 26', I have a new (1-year-old) Carrier AirV low profile, 15K BTU. In 100+ temps, my A/C cools down to 78 within 30 minutes or so, and the compressor continues to run near-constantly. But as you might expect, the further away from the cold air you get, the warmer it is. The bathroom is more like "tolerable" under those conditions, while the bedroom and galley/front lounge are very comfortable.

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Old 06-24-2009, 12:35 PM   #12
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As I do not have documentation to help with this. "I would not use Duracool R-12a". The R134a is the prefered replacement and is the closest to R-12 in the ability to transfer BTU's than the Duracool. I looked on the website and could not find a chart of such.

Also, I liked how they stated that R-134a was global warming...duh isn't that the point? Get the heat out of my trailer...?

Naw, they were saying that the process to manufacture it contributes to global warming, but isn't all processes?

Anyway
Good-luck
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Old 06-24-2009, 03:28 PM   #13
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Interesting take on 12a. Here are some links I found that had me considering it since even 134a is flammable, has a lower flash point and higher head pressures.

Legal Status of HC-12a «, DURACOOL 12a «, and OZ-12 « | Alternatives / SNAP | US EPA

Bennett Cycle & Supply - 1-866-865-6233-Links -faq

Keep in mind from what I've read the EPA has not looked at this in over 10 years.

I will also add that I have installed R12a into a commercial refrigerator. It has run on 12a now for 6 years and has provided cooling along what I expected. This fridge is housed in a shed and though it is not exposed to the elements (rain, etc), it does see the extreme temps both hot and cold that the greater Louisville area does see annually.

I like the next guy don't ever want to do something stupid, but with my exp so far with 12a and a lack of any real reasons why not to use it, I am still considering it for my automotive applications. Keep in mind that the average unit takes maybe 1lb 6oz of this stuff. Even if the entire engine bay hit 1800 degrees, by the time something were ready to explode, the gas would be long, long gone wouldn't it?

If in fact these were dangerous, and around now for over 10 years, why has no one halted the sale of this stuff like they did with straight R-12? I may be way off base here (as I've been known to be from time to time), but I smell a bunch of lobbyists at work here.
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Old 06-24-2009, 08:47 PM   #14
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Quote:
Originally Posted by Lothlorian View Post
How well does you airconditioner work when it is 95+ degrees out? Does it keep it really cool, comfortable, OK, a little warm? I had a friend checking out my airconditioner when it was blazing hot out and he said his motor home stays very cool until it gets really hot out and then it can get a little warm in there. He feels my air is working fine.

I have a 27' with a 15000 BTU airconditioner.

How well does your air work.

Brian
Our 27' with only a 13,500 is never satisfactory in direct sunlight even if the outside temps are in the 80's. Forget about Texas when it is 100║ outside and humid. We only camp in cool places in the summer and camp locally only in cool or cold weather. This is one of the biggest disappointments with my trailer.
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