Question about Dometic Rooftop RV Air Conditioner

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Have a coleman mod 8333-8664 and it comes on and just blows air, doesn't get cold. Is it the whole unit or some kind of solenoid.

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  • Dometic Master
  • 5,743 Answers

Possible bad compressor

Posted on Oct 06, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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hotuna
  • 288 Answers

SOURCE: Coleman RV Rooftop Air conditioner

If the compressor is tripping the breaker, then its 1 of 2 things. First clean the coils and change the air filter. If the coils are dirty and/or the filter is clogged, it will make the compressor overload and the high amp draw will make the breaker trip. If this doesn't solve the problem, you need to check the compressor itself. remove the connections at the compressor, leaving only 3 posts on it. You will need a meter to check for continuity to all 3. They should all have continuity to each other. While there check the wires. Sometimes a burnt wire will come off and arc on something causing the breaker to trip, if you are lucky.

Posted on Mar 02, 2008

22yooper
  • 828 Answers

SOURCE: Recharge My AC Unit

The system needs to be accessed through what is call a tap valve. After a tap valve is in place a high vacuum should be pulled on the system down to 500 microns to remove air and non condensible gases along with any moisture from the system. Then the charge should be weight into the system according to the name plate with the proper type of refrigerant, generally Refrigerant 22. An alternate method is to charge the system by superheat of the gas returning to the compressor. Ambient temperature determines how high or low the superheat should be.

Posted on Jun 20, 2008

motor1258
  • 6674 Answers

SOURCE: Coleman rooftop a/c unit, fan runs, compressor come on/off

First of all, Shut off power to A/C unit. !! Next,You need to remove the filter /cover ceiling assy, and with a flashlight, look way up inside and you'll see the cooling fins etc, that look similar to the back of the AC on the roof. If they appear dusty/dirty, then they need to be cleaned. I use a shop vac with a couple of extra extensions to reach, and duct tape a pot scrubber brush (half round or round with nylon bristles) to the extension. Then start as high as you can get on the fins, and come straight down, kind of like combing the fins, but not pressing super ******* them. Move over, and down again, until you get them all, or at least as much as you can. (Thats basically the same as your return air at home) I use the nylon scrubber because the brush attachment with vacuum is usually softer bristles, and doesn't get in there as well. If yours does, great.Make sure you wash out your foam filter in a little dish soap & water before you put inside cover/filter back up. Now to the best part, The upper unit on the roof. You need to remove the plastic cover, by removing the 4 screws holding it on, or if it's dometic type, screws all around near the bottom of the cover, and lift it off. The front of the colemans have a lip that the cover is down over, so you may have to pull cover forward & up, then it should all lift up & off. Here's a spot to be real careful, and ready for wasps & bees. Very few, if any that I've done over the years, haven't had a bees or wasps nest under them, so if you can do it on a cloudy day, or at least be ready to move quick, and have a wasp blaster spray with you, it may be smart. Just don't forget your on a roof when you start moving !! Another thing to remember too, is that the roof can be very slippery when wet, or dew is on it, so watch out!! Be careful !! Now with cover off, look at the fins on back of the unit, and clean those the same way, or spray with a garden hose, and soft brush, and clean them up. Next, look at the opposite side of those coils/fins, where the fan blade is in front of it, and lightly wash it down as best as you can with the hose, spray nozzle, and a brush if possible. Remember when using brush, up & down as much as possible, to avoid bending the fins over. If you can't brush it , just spray it as good as you can, to clean it. Water should not enter trailer, unless maybe if you go overboard with spray, and pressure. If you have access to an air-line to use up on the roof, that's good to, but a lot of times, the water will wash it down better. This will more than likely cure your problem, if you get it cleaned out. At the RV resort where I work as a Technician, we usually have a flat rate of approx. $50 CDN. for me to do it for you. 95% of the time it cures the early cut-out of compressor, and people actually report it cools better than it has for a couple of seasons. It has to be clean to do it's job properly. When those areas are dirty, the upper unit (compressor etc) has to work so hard to cool, it overheats & cuts out, until compressor cools down a bit, then comes back on, until it heats up too much again, and kicks out again. That's why it doesn't do it as much in cooler times, because compressor doesn't get as hot. Your also shortening the life of your unit too.

Posted on Aug 14, 2008

  • 4 Answers

SOURCE: carrier air-v AC is not blowing cold air

There could be a freon leak, or just low freon levels. If this is the case, you have to call a certified a/c technician to recharge your system.

Posted on May 19, 2009

  • 587 Answers

SOURCE: have a coleman rooftop unit a/c unit, after about

COLEMAN R.V. AIR CONDITIONER SERVICE AND REPAIR QUESTIONS
COLEMAN R.V. PRODUCTS
GO TO rvcomfort.com

Click on RVP (RV PRODUCTS)
Click on type of AC, if you can’t find the information you want there,
then click on contact us on the Green Bar.
You can get Service Support or Email address and Phone numbers.

Posted on Jun 09, 2009

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1 Answer

I have brand new coleman mobile home furnace model # DGAH056BBSB the pilot light (elec. Start) wont stay lit and it blows COLD AIR! PLZZZ HELP Ohio is COLD


here, the last sentence is important.
http://www.ehow.com/how_5615197_light-coleman-furnace.html

Further information here.
http://handymanwire.com/ubbthreads/ubbthreads.php/topics/28213/Pilot_light_won_t_stay_lit

But if the unit is new, it must be under some sort of warranty from Coleman and from the fitter.

coleman website, support, contact and warranty, but the website doesn't list, heaters, or furnaces? I am puzzled.
http://www.coleman.com/warranty/

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My coleman central electric furnace only blows cool air


The AC unit outdoors must be running and rejecting heat by its air flowing through it the 2 copper lines are the refrigerant lines, the fatter one should be "beer can cold" if not its low on refrigerant or not running.

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I have a 2010 30' cougar travel trailer, we have never used the air conditioner which is a coleman mach model, when I put it on auto and cool it blows cool air but never gets cold am I suposed to


Check the temperature of the air coming out the vent If it's more than 10 degrees below the air going in it's ok. If it's the same temperature, the condensing system may be not working. The compressor may just be a quiet one!

May 18, 2012 | Coleman Mach III Air Conditioner

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I have a 85 coleman a/c unit (6759b714) it started blowing hot air,was cold. what kind of freon do I need? and is the fitting universal?


It's a closed system, no fittings. You can have system recharged but would need to evacuate, cut lines , solder on fittings, re-charge etc and that gets pretty expensive. Usually better off to replace with new and get warranty with it. Do you hear compressor even trying to kick in? It may be something less expensive. Give me a quick rundown on when it ran good last, what appears to be happening now. Maybe I can help.

Aug 29, 2011 | Coleman Mach III Air Conditioner

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I have a roof top ac unit Model #7333C886 and someone is telling me that it cannot be recharged. Is this true cause it seems to be working fine other than not getting real cold. It is an older model I know...


It is a closed system, which normally they don't require recharge. It can be done but it is more or equal expense as buying a new unit. A lot of times a real good cleaning by someone who knows how to do it properly is all that is needed in cases such as yours.

Aug 23, 2011 | Coleman Mach 15 Air Conditioner

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Compressor kicks on, but only barely blows any air. Its cold but little to no air is coming out. Then it quits altoghether. Could this be the run capacitor?


it sounds like the unit is low on charge or a bad blower motor turn the ac off and turn just the fan on does it blow out any air?
check your filters to make sure they are clean
if these are both ok i would call someone certified to check refrigerant levels

Aug 04, 2009 | Coleman Mach 15 Air Conditioner

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It is not blowing cold air


Could be many thing at this point. What noises are coming from it? Whats the model of the unit? Can you hear the fan(blower) come on?

Jul 14, 2009 | Coleman Mach III Air Conditioner

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Recycling to soon?


sounds like the unit is low on freon. it will need to be serviced so the leak can be fixed then recharged.

Jun 01, 2009 | Coleman Mach III Air Conditioner

1 Answer

Compressor lines


If the large line returning to the compressor is frosting you don't have enough air circulation. Check air filters on inside unit.

May 12, 2008 | Coleman Mach 15 Air Conditioner

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