Question about Dometic Rooftop RV Air Conditioner

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A/C is blowing out chunks of ice!!!

The fan blows fine, and the ac works fine for about 4-6 hours, but during the night, pieces of ice come flying out of the vents. It doesnt shut off or anything, and if we leave it off for an hour or two it works fine for another few hours. Is this a freon problem? What do I need to have to check it myself?

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  • 230 Answers

If it is not shutting off, I would believe that it is do to either a bad thermostat or a stuck relay (probably on the roof unit). Both are relatively cheap and easy. If you have it done by a tech, have slap the gauges on while he is up there to check the refrigerant levels.

Posted on Jul 03, 2008

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2 Answers

The ac blows but it dosent blow kool fan works and its full of freon what should i do and if it blows kool it only blows kool at night


You have the system leak tested

Then have it evacuated & leaks repaired
& recharged

It only cools at night because it is low on refrigerant
& during the day it is so hot in the condensor
that it boils off refrigerant before the expansion valve
& doesn't cool the evaporator

No -- you can not add & polute the atmoshpere

I would think there may be air in there also

Can not work on it yourself

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It's most likely an airflow problem, you say you had the vents closed? Icing up is normally caused by lack of load (air flow) or loss of refrigerant charge. Make sure all your vents are open to allow for as much airflow as possible and that your filter is clean. Some units do not work well on low airflow setting when the outdoor temps cool down at night.

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1 Answer

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1 Answer

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