Question about Dometic Rooftop RV Air Conditioner

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I bought an older camper with a colman roof unit ac. My question is do I need to put small filters under the intake grates inside the camper below the ac cover. There is nothing in there. (bought it this way) thanks

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  • dreammakerre Jul 30, 2009

    Excellent! thank you

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  • Master
  • 867 Answers

Its good to put them in, as it will keep dust from building up on the coils, thus reducing cooling.just buy some filter material at any hardware store, coarse, like a sponge, not fine paper stuff.

Posted on Jul 30, 2009

  • bozcro
    bozcro Jul 30, 2009

    you are welcome

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1 Answer

Coleman Mach 48000 series roof top A/C in my camper & recently it's been dripping heavily inside the camper. We looked at the top & inside for a clogged line & can't find anything, suggestions?


I had the same problem but it wasn't a clogged drain line, it was the gasket between the roof of the camper and the AC unit. The gasket had shrunk and pulled apart allowing rain water in. To make sure you don't have a clogged drain line when using the AC do you notice water dripping off the camper anywhere besides inside? You should have some drips somewhere on the outside.

Jul 18, 2017 | RVs

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Roof leaking on 2003 breckenridge camper


Most roof ac units sit on a seal that fits around the opening outside, and on the inside there should be 4 long retaining bolts that that have or go thru some brackets, that squeeze the unit down. Kinda "sandwich's" the roof, if you will. I've simply tightened these 4 bolts carefully, and stopped the leak. Or the seal is damaged. And it also may be the drain. The opening will be under the plastic shroud. With the shroud removed you should be able to see a small opening near where its wet on the roof. I normally spray quickly with water at the opening. It normally clears easy. Condensate drain or weather seal.

Jun 27, 2015 | Heating & Cooling

1 Answer

Where is the drain?


There are grooves on both sides of ac unit on a camper and it drains down the roof to a little gutter that travels the water towards end of camper and drains. Most of the time down the side of camper, but if these Grove are stopped up it will not allow it to drain and cause it to overflow inside camper. If filter is very stopped up or evaporator coil is stopped up, fan not running, low on refrigerant, or having the thermostat set way to low can cause it to freeze up and when this water thaws out it is too much for the drain to handle and also ice could be sticking being the drain pan melting causing it to go in your camper. I would check filter and those drain grooves first.

Sep 17, 2012 | Coleman Mach 15 Air Conditioner

1 Answer

Water drips into the camper through the foam rubber air intake, after it runs for awhille


Sounds like your drains for drip pan under the evaporator area are plugged. They are located at the base of the AC unit on roof. Look real close under AC unit near front, for a hole in base plate of AC on each side. Water ( condensation ) should be dripping out of those holes pretty steady when running.
You should have an inch or so clearance between base of AC and roof to try and get a bent piece of wire, or similar in to hole and try to clean it out. If that doesn't help you will have to remove plastic cover and remove all the screws that hold the front cover over the evaporator and remove the front metal cover. Look down at base of the coils and fins and you will see a drip pan that has small holes at each end for drainage. They will get plugged up with debris, thus poor, if any drainage. I use a long air nozzle and a small compressor to blow them and the tray out to clean it well. That will usually cure your problem. Please remember to shut all power to AC, off at breaker panel before removing the cover on roof to avoid electrical shock.

Sep 04, 2011 | Dometic 57915531 Air Conditioner

2 Answers

I have a jayco pop up camper with a Duo-Therm BriskAir roof top a/c. im having problem with it leaking water inside of the camper? Is there a drain hose? Or wat do u think is wrong?Thanks


Yes there are drain holes in base of upper unit (on roof), which may be plugged. Couple of questions though to see if we can better troubleshoot this for you.
-Do you remember seeing water (condensation) running off roof before when AC was used?
-Have you cleaned filter inside at ceiling lately?

May 17, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I installed a new colman mack thermostat in my camper witch has a colman ac unit now ac unit runs 5 min then shuts off for 3 min then starts again and keeps doing this . so I by past thermostat and it will...


if it is a programmable thermostat you can unhook thermostat and when it comes on select 3 instead of 1. As it sounds as though it is short cycling this happens in older houses with drafts. Hope this helps Tim

Sep 07, 2010 | Coleman Mach III Air Conditioner

1 Answer

Was given a roof top ac for a popup camper need help


Make and model of unit should be on base of roof assy, please reply with that so we can be sure we have right wiring info for you. Although they are pretty common, let's be sure.

Jul 30, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Pop up camper-leaking from ac unit when it rains.


Personally I would undo the 4 bolts that hold the upper unit (outside) to lower unit (inside) , then with circuit breaker off & confirmed that no power to it, take cover off for hydro connection, and unhook those wires, and unclip harness from connector to upper unit, to allow for removal of the lower & upper unit, then remove both upper & lower and cover the hole for now until you decide on whether or not your going to fix the roof supports in that area. I'd cut a 16" square piece of painted plywood or fairly stiff aluminum, add a good thick bead of sealant (not silicone, it doesn't last long) to the area where you see the gasket was seated & screw the cover right to the roof for a temporary fix. Make sure you attach screws close to where gasket would be under your cover, (about 1"-1-1/2" in from edge of 16" cover) so that the holes will be covered later when AC unit put back on, by the gasket of the AC unit. Make sure you put maretts back on hydro wires & add some electrical tape over them as well to keep maretts on while traveling for now. Don't know how handy you are, but fixing that over the winter may not be as bad as you think. If you need advice later, get back to me/us.

Aug 31, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Help, Brand New A/C unit drippin inside camper


they do that its normal operation, you will get varying amount depending on your location and humidity. If it is not balanced or installed right it drips in the camper.

Aug 16, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Contensation leaking into camper


Check on roof, look under at base of AC unit for 2 knob like things sticking down, they are drains. use a piece of wire or small stick & try to poke inside there. You might have to look hard to find hole. Pay attention to run off on roof, if not as much as usual, that's a good indication they are plugging up. If too hard to get to, remove 4 screws & pop cover off, but watch for wasps or yellow jackets before you do.

Aug 06, 2009 | Coleman Heating & Cooling

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