Question about Dometic Rooftop RV Air Conditioner

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Roof top a/c seal

How do i replace the seal that the unit sits on?

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Pull the old one off and put the new on.

Posted on Apr 10, 2008

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Not understand

Posted on Mar 16, 2008

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Posted on Jan 02, 2017

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1 Answer

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

3 Answers

The 'H' frame leaks


If the unit was installed buy the agent then they are responsible to stop the leak don't let them get off of taking care of it. make sure they are pulling the unit off the roof to replace the gasket and just putting silicone around the edges because it will just pull a loose when pulling camper due to body flex. if you put plastic over unit you know there is no water leaking from inside the unit so it only can becoming from around it. Bad seal

Jul 03, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

Water coming from ceiling about 3 foot from unit


Does the unit work other, than the leaking?If it does you need to install a square seal between the ac unit and the roof.You can either buy the seal from Ebay or I would recomend an Rv Repair place.(They Might even be able to install it where the Rv Sits)

Aug 05, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

My roof top unit is letting the condensation run into the coach.


Either you need to replace the square gasket between the ac and the roof or you need to seal/replace your roof..

Aug 03, 2010 | Coleman Mach III Air Conditioner

1 Answer

2002 XJ8 41,000 miles. At 70 to 75 MPH wind noise from the roof line on front passanger side. Taped the drip line all the way from fender to top of roof but still get noise. Door seals on both the outside...


Most cars are very quite at that speed.
A seal must be out of place somewhere.You may have to tape the sun roof and door opening completely on the outside for testing.
Also,sit in the passenger seat and have someone drive while you listen at different areas of the door edges and roof areas through a leftover paper towel center tube.
You have some age on the car, just wiping down all rubber soft seal parts with a good rubber conditioner may help too.
.......and don't overlook the door glass seals.

May 18, 2017 | 2006 Jaguar XJ8

2 Answers

Leaks where it sets on roof how does it bolt to the roof


There is a bolt on each corner that tighten from the inside. You will see them when you remove the inside cover. There should be foam weather stripping around the opening that the unit sits on and then it's tightened up.

Oct 13, 2009 | Coleman Mach 15 Air Conditioner

2 Answers

Roof Top air conditioner makes too much noise


Hello; Those roof tops can be noisy. Are you able to determine what is causing it? The fan? The A/C pump? Over tume, the vibration isolators that are rubber cushions the pump is mounted on, get weathered and hard and they no longer absorb the vibrations of the running pump. Those are easily chked and changed. The next point of excessive noise is the unit as a whole is tranmitting the combination of all the vibrating parts including its own housing. Here too we have a remedy. The roof unit has a seal between it and the camper roof around the hole it is fitted in. The seal is foam rubber and reasonably thick enougth to serve a purpose more than to seal out water and air. After and over time this seal ends up crushed from the weight of the a/c unit. Then the A/c unit comes in contact and is actually resting on yhe roof with what is now a very flat hard gaske. The roof unit is now vibrating the roof. This is as destructive as it is annoying. Ok? Now let's get rid of 80-90% of the noise. Check and replace compressor vibration isolator mounts. There are 4 bolts holding down the A/C unit. Sccess them from the inside by removing the ceiling trim and cover.There should be one on each corner. Bolts removed, one person push up on the unit and another on top lifting the unit. There are wires going to the unit and those may need to be disconnected. Clean the roof and the a/c where yhe seal goes.You can get a new seal from camping world or rv supply. Have your measurements, Unit make and model when you go.Assembly is just backtracking. On assembly, thinhs to pay attention to are:
Put the new seal on the A/C unit, not on the roof. It takes two people to ligft and set the unit back into the hole and center it in the hole. Don't slide it on the seal. lift it if it hs to be moved or the seal may roll over..
The wiring disconnected earlier must be dealt with and put in place for reconnecting.
Now start the bolts that hold the unit down.
Make sure-- Unit is centered
Wires can be reconnected
The four hold down bolts have their washers.
Someone go topside and verify the seal is properly in place. Measureing the for corners fo even height is one way to ck and looking under the unit is another. Now tighten the four bolts evenly. corner to cross corner. measuring again will help confirn its pulled down evenly. Pull it down no more than 1/4 to 5/16 of the seal thickness. Wire it up and put the trim and plastics back on and light it off. (run it and ck for noise and vibration. NOTE!!! The A/C unit cannot touch any solid part of the roof. Reason it was centered. Always ck the unit before each trip as you would any other psrts on the exterior of the camper. Good Luck Angie.

Sep 15, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Rain water comes in the car from the top, or moon roof. Is it because the drains are clogged or what?


well the easy way to check is open the sun roof look from the top of the car inside the sunroof is there sitting water in the little drain areas around the sunroof if so the drain is not working... if no sitting water pour some water in see if it drains if it does drain it is prolly the seal isself so if the water drains fine then close the sun roof and spray it with a hose if it still leaks in prolly the seal...if its the drain hose you will have to trace it it useally runs down the a piller let me no what you find or have other questions

Mar 28, 2009 | 2000 Volkswagen Beetle

2 Answers

Seal for roof top ac unit


I just spoke with the mechanic at my RV dealership and he said the sticky side goes on the a/c unit. You only have to turn it on it's side to do this. Just wait 1 hour after re-installing the unit on your RV before turning it on.

Apr 17, 2008 | Dometic Rooftop RV Air Conditioner

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