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 > Fish bowl cooling class A

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rdhetrick

Texas

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Posted: 05/03/21 11:35am Link  |  Quote  |  Print  |  Notify Moderator

JCat wrote:

I have always had a problem cooling and heating the fish bowl on my RV.
The dash air has never cooled the fish bowl and the front air does not send enough air while driving to the front.

I’ve tried directing the flow to the front, using a fan to push the cool air to the front, nothing works.

Also I do drive mostly out west with temps over 90 many times.

So has anyone done any creative ac mods to help this situation ?

Like replacing the dash ac system and putting in something that works, or adding some type of stand alone ac unit in the front ?

Let me know

Jcat
2004 Mandalay 40 D


Having a very similar coach as you, I face the exact same problem. Hot in the summer, cold in the winter. In the winter, I can feel the cold air, in the summer, it's just generally hot. I suspect air leaking in from outside but I haven't been able to pinpoint where it's coming from. I even put a fog machine in the generator bay while parked looking to see where the air came in, with no luck.

In the summer, I've had the most success opening the louvers on the front air so most of the air blows straight down, and a fan a few feet behind that blowing forward. Certainly not cold up front, but made it a little more tolerable. My bigger problem is keeping the engine from overheating in those conditions!

I recently got a thermal camera and will be using it on my next trip to try and see where the air is coming in from - I suspect it might be around the stair well. It will probably be more revealing in the winter, but I'll try it anyway. If I come up with anything useful, I'll follow up here.

Forgot to mention - I had the dash air serviced a few years ago, it seemed to help in the sub 90 temps, but didn't make a difference above 90. The next year, it didn't seem to make much difference at any temp, and I'm not about to spend $500 or $600 each year for a marginal improvement.


Rob
2006 Mandalay 40E Full Time
2015 Jeep Grand Cherokee

Acampingwewillgo

USA

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Posted: 05/03/21 11:37am Link  |  Quote  |  Print  |  Notify Moderator

My dash AC hasn't worked in 20 years and I too, live in So. Calif so I've tried just about everything short of fixing the dash air. The portable AC did work somewhat but fabrication an exhaust port with that funky 6" hose is difficult.

To cut to the chase, since your dash air works your way ahead of me already so short of adding another roof air directly above your "fishbowl"...fan are your friend.
Good luck!


96 Vogue Prima Vista
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rgatijnet1

Florida

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Posted: 05/03/21 11:52am Link  |  Quote  |  Print  |  Notify Moderator

I have a Monaco gasser but for what it is worth, your problem may be the lack of insulation above your cockpit. On my unit I had to remove the front cabinets because of another issue. What I found was that they had put in fiberglass insulation that had shifted and compressed. I had areas where the front cap actually had no insulation covering it at all. I removed all of the fiberglass insulation and replaced it with spray on closed cell foam that I bought on eBay. This is a two part foam that expands when it sticks to the surface. This made a huge improvement in keeping the temperature down in the front of the coach. I also made sure that the roof above the cockpit was painted white. You might see if you can see behind your overhead cabinets and check the condition of the fiberglass insulation.

JCat

Big Apple, SoCal, Big D, everywhere USA

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Posted: 05/03/21 11:57am Link  |  Quote  |  Print  |  Notify Moderator

Doug - never heard “fishbowl” come on man, that’s been around for 41 years [emoticon]

And Robs post is right on the money as far as a mandalay is concerned

I would love to add another ac unit above the fish bowl, but unfortunately that is where direct tv lives.
I need DT when I’m camping, and roughing it.


JCat & PCat
2004 Mandalay 40D
CAT C7 350 HP

dougrainer

Carrolton, Texas

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Posted: 05/03/21 02:13pm Link  |  Quote  |  Print  |  Notify Moderator

JCat wrote:

Doug - never heard “fishbowl” come on man, that’s been around for 41 years [emoticon]

And Robs post is right on the money as far as a mandalay is concerned

I would love to add another ac unit above the fish bowl, but unfortunately that is where direct tv lives.
I need DT when I’m camping, and roughing it.


Lemmee explain to you[emoticon] I am 66 years old. From 1973 until 1978, I built both Class C and Class A Motorhomes in Middlebury, Indiana. From 1979 until now (42 years!), I have been a DFW based RV Tech and for the first 20 years, I was basically a Class A/Class C motorhome Service Tech, and when we branched out to towables in the 1990's I also serviced Towables. I have been a Master Certified Tech for almost 25 years, I was one of the first to achieve Master Certification. So, I have heard what I thought was ALL slang over the years. We sold National out of California, so at no time did I hear the term Fishbowl. Just in the past 3 weeks I heard a Leveling Jack called a "Stanchion". Which IS a correct term for a jack, just not used in the RV industry. So, I now know what a Stanchion and a Fishbowl is.[emoticon] Doug

PS, you bring your Motorhome in before this thread and stated you had a problem with your Fishbowl, I would have to call you to find out what you mean or I would have the Service Advisor call you and tell you to get your problem fixed at a Pet Store[emoticon]

ferndaleflyer

everywhere

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Posted: 05/03/21 03:06pm Link  |  Quote  |  Print  |  Notify Moderator

I never heard that either Doug and I am 80 years old. At the rate they are changing the English language to just the first letter of a word I soon will need an interpreter to understand anything.

tragusa3

upstate south carolina

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Posted: 05/03/21 03:16pm Link  |  Quote  |  Print  |  Notify Moderator

We struggle at times too. My wife hooked me up last summer. She put a dryer hose vent attached to the rooftop air register and hung it just inches above my head. Looks goofy, but I was COLD in any weather. Plant to do it again this summer.


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folivier

Southeast Louisiana

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Posted: 05/03/21 03:45pm Link  |  Quote  |  Print  |  Notify Moderator

Here's a thought. You have 2 roof air conditioners, I'll assume they're ducted and are in the living area and bedroom area. Your rear a/c thermostat will keep the back cool but will shut off the compressor when it hits the set point. So set your bedroom thermostat at its lowest setting and turn off the vents in the bedroom so that all of the air is sent to the front.
On my coach I have 2 Dometic a/c's controlled by 1 thermostat in the front. There is a sensor in the bedroom that controls the rear temperature. If that is unlugged from the rear a/c then it works from the front thermostat. I added a switch so that I can turn it off when I want it to work off the front thermostat. That helps keep the front cooler on hot days.

dodge guy

Bartlett IL

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Posted: 05/03/21 05:15pm Link  |  Quote  |  Print  |  Notify Moderator

Even in 90 degree temps my roof air will keep the living area cool. the dash air is adequate. run the roof AC`s and the dash air on recirculate and you should be good. have you had the dash AC inspected and possibly recharged?


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Son Brandon 17yrs
Daughter Marissa 16yrs
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Dutch_12078

Winters south, summers north

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Posted: 05/03/21 05:55pm Link  |  Quote  |  Print  |  Notify Moderator

Maybe I missed it, but I don't recall anyone mentioning running above the windshield defroster fans to circulate the heat away from the windows. That makes a noticeable difference in the dash cooling effectiveness for us.


Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate


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