OK, so My 29'Cougar/Dometic has a history of AC not doing well, by that I mean struggling, and often freezing up. However, I spent some time this winter re-taping the ducts up in the unit and thought I had it fixed. The main problem up till now has been freeze up, yes, even with it on high and all vents open for full flow. Ran it 6 hours yesterday, and NO FREEZE UP...Yay!! But thermometer still showed over 80 in the unit. Here are the specifics.It was in my shop, and I turned it on around noon. So no sun, but it was pretty warm in there, especially 12' high near the unit. After six hours, it showed no signs of freeze, water was still dripping so it was still pulling moisture out. I showed 74 degrees coming out of the main vent, and showed at least 95 outside at the unit; maybe even 100 up on top.But it seems to me she should be blowing colder air. The only thing left I can think of would be that the Freon is low. I know that it's a sealed system, and a pretty new unit, but is there anything else it could be? Cold low Freon be a possibility? My thought is that if I had a leak, it would be empty by now, but what say you all??Thanks...Mick

I would be curious of the temp of the air going into the return by the filter and the temp. of the air out of the ducts. Should see close to a 20 degree differance.

Yeah, NO. Had 80-85 going in, and 74 coming out of the main vent right next to it.

mick2268 wrote:Yeah, NO. Had 80-85 going in, and 74 coming out of the main vent right next to it.Is the evaporator and the condenser clean?? if so I would tend to believe that is low on charge. The fact that it freezes up make me lean toward a low charge. If you can get access to the evaportor the coil that cold air comes out of. and run your fingers along the end coil bends you should have all the the bends cold if just a few are cold and the other warm good sign of a low charge also.

OK, so forgive my ignorance, but can you explain further? So I can access coils from inside the camper on the intake side. Which ones are those? And of course I can get on top tomorrow and pull cover to access the others, which are those?To be more specific on unit, it is a Dometic brisk Air, not sure if it's 13.5 or 15K btu, but assume the smaller on a 2014 cougar light 29'

inside is the evaporator and outside on top in the condenser. If you have access to the coil bends on each side of the coil that is a good place to feel the cold and the whole row from top to bottom should be cool if only a few then there is likely a low charge. but it is a good time to clean the outside coils that can lower the work the usit need to do and the high pressure that it sees if clean. I think they make a spray solution that cleans the coil, but a low press spray of water to flush the coil clean. too much you could get water inside so be careful. From the top the entire evaporator will most likely be covered. Good time to oil the fan motor usually a small plastic or aluminum plug is removed and a few drops of oil on each end bell of the motor. good luck be safe.

Is this normal AC operation? | Good Sam Community

Ed9824v
Explorer
Jun 02, 2018
inside is the evaporator and outside on top in the condenser. If you have access to the coil bends on each side of the coil that is a good place to feel the cold and the whole row from top to bottom should be cool if only a few then there is likely a low charge. but it is a good time to clean the outside coils that can lower the work the usit need to do and the high pressure that it sees if clean. I think they make a spray solution that cleans the coil, but a low press spray of water to flush the coil clean. too much you could get water inside so be careful. From the top the entire evaporator will most likely be covered. Good time to oil the fan motor usually a small plastic or aluminum plug is removed and a few drops of oil on each end bell of the motor. good luck be safe.
mick2268
Explorer
Jun 02, 2018
OK, so forgive my ignorance, but can you explain further? So I can access coils from inside the camper on the intake side. Which ones are those? And of course I can get on top tomorrow and pull cover to access the others, which are those?

To be more specific on unit, it is a Dometic brisk Air, not sure if it's 13.5 or 15K btu, but assume the smaller on a 2014 cougar light 29'
Ed9824v
Explorer
Jun 02, 2018
mick2268 wrote:
Yeah, NO. Had 80-85 going in, and 74 coming out of the main vent right next to it.

Is the evaporator and the condenser clean?? if so I would tend to believe that is low on charge. The fact that it freezes up make me lean toward a low charge. If you can get access to the evaportor the coil that cold air comes out of. and run your fingers along the end coil bends you should have all the the bends cold if just a few are cold and the other warm good sign of a low charge also.
mick2268
Explorer
Jun 02, 2018
Yeah, NO. Had 80-85 going in, and 74 coming out of the main vent right next to it.
Ed9824v
Explorer
Jun 02, 2018
I would be curious of the temp of the air going into the return by the filter and the temp. of the air out of the ducts. Should see close to a 20 degree differance.

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