Question about Dometic Rooftop RV Air Conditioner

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My coleman. Roof air is not blowing cold air....it worked last year but won't blow cold now...I also need a cover for the top unit

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6ya6ya
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Posted on Jan 02, 2017

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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

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  • 113 Answers

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

check ur freon level

Posted on Jun 22, 2008

  • 17 Answers

SOURCE: 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.

Posted on Jun 06, 2009

co7196
  • 3433 Answers

SOURCE: Have roof top air conditioner that blows air but

check the condensor fan in the rooof unit. It's the fan blowing on the cpil on the roof.. If it failed, the head preasures can becme excessive andwork the compressor hard causing the breaker to trip. Let me know and good luck, Ned_

Posted on Sep 13, 2009

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1 Answer

I have a coleman mack roof ac and the air is cool but the fan is not blowing it out. We left it off last night then turned it on this morning and it worked well for a while then quit blowing. Any...


Soounds as though the motor is getting hot and kicking out on overloads.. best have it checked . But my money is on your going to need a new motor..

Jul 18, 2011 | Coleman Heating & Cooling

1 Answer

I have a travel trailer with a coleman 7300 roof top ac unit. the unit will blow cold air but water leaks thru the plenum. i was told by the previous owner that it needs a new seal. i would like to fix it...


If it's leaking inside where filter cover is, then real good chance the drains being plugged is the only problem. If water (condensation) not running off roof when operating in cool mode, then I'd bet drains, which are located under unit on roof, and you should see them sticking down like buttons. They have a hole in side that needs cleaning with a pipe cleaner or similar to open them up. If need be, shut off power to unit and remove top cover on roof unit and look for the drain holes in base, and clean them out. If water comes in while raining, but AC not running, then it's gasket. That is remedied by removing ceiling assembly (just screws) and 4 bolts that pull/hold the upper and lower assemblies together, unplug wiring to upper unit, and simply lift it off, change gasket and re-install. Tighten those 4 bolts equally when gasket is aligned properly over hole, only until gasket is approx 1/2, original thickness. Plug harness back in and your done. (about an hours work.) Only other thing that may be wrong is styrofoam drip tray for cooling unit, under cover on roof may have a crack , allowing condensation to leak in. If that 's the case, you can try to find a sealant compatible with styrofoam to seal those cracks.

Nov 14, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

Fan not blowing in coleman trs rv roof air


well check a few things first....have someone remove the cover and reach in with a hand and try to manually spin the blade...free spinning?....then tell the person below to click in the on postion while someone views from up top.....is it humming? or even trying to spin?....if not check the fuse on the RV that protects the A/C unit.....good?.....now replace the capacitor ( it the silver or gray can looking thing that the motor wires run to) only the correct size will work w/o causing further motor damage.

Jul 08, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

2 year old Coleman Mach III tapping and not blowing cold air:


Make sure the condensor fan is blowing through the condensor on the roof. It sounds like the compressor is fighting high head pressures after running a bit.. After so many attepts, or if it suceeds in operating the load trips the circuit breaker.. Make sure the condensor is clean and air is passes through it from the fan. Just for clarifiication the condensor is the coil that gets hot and the evaporator is the coil yat create the cold air. Good Luck, and if you will, let me know how it turns out. Good Luck. Ned

Sep 19, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

My coleman 13,500 roof a/c year 2000 does not blow as cold as used to. I have cleaned the top condenser coils, with no help. It also at times will seem to pull a heavy load when I assume the compressor...


if the compressor started and stoped means
1 thermostat need settings
2 compressor over heated due to low suction pressure need to check and repair the leak then charge the freon

Sep 14, 2009 | Coleman Mach III Air Conditioner

1 Answer

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

2000 roof-top Brisk-Air


I think you have a high pressure cutoff cycling the compressor on and off. Clean the filter inside the unit. Then with a hose clean out the foil condenser filter on top of the camper. Also you may need to buy a coil comb and comb out bent or damaged areas of the condenser coil on the unit that is above the roof of the camper.

Jun 09, 2008 | Dometic Rooftop RV Air Conditioner

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