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I have a dometic, I cleaned coils and still have problem with it frosting after running unit for an hour. It also does not blow out vents hard.

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  • Michael Youngman
    Michael Youngman May 12, 2010

    How old is the unit and do you have any pets? If it's an older unit, chances are you have lint build up on the back side of the indoor refrigeration coil. You said you cleaned to coils. Does this include the indoor coil on both sides?

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Your problem is 'very little air' across the coil and assuming you've cleaned the cooling coil - then the problem has to be with your fan motor. It must be breaking down (the motor is shorted) and running at a vastly reduced speed (which I seen them do before).

In which case you'll need to replace it - either yourself or have it replaced by a Service Tech.

Posted on May 12, 2010

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TO LO OR HIGH!!! ALSO THE FILTERS COULD BE DIRTY OR AN AIR RESTRICTION IN YOUR RETURN AIR DUCTWORK OR DUCT IS NOT BIG ENOUGH.{ NOT ENOUHG AIR BLOWING ACROSS THE INDOOR COIL} IF THE UNIT ISEQUIPPED WITH A TXV THIS COULD BE CLOGGED AND WILL HAVE TO BE REPLACED BY A CERTIFIED A/C TECHNICIAN. FIND A FRIEND WHO HAS A TRUSTED AND HONEST A/C GUY... GOOD LUCK

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Hi Louis,

This is what has happened. Due to the door being opened for so long moisture which is naturally in the air has collected on your freezer coils. What you need to do is turn the whole thing off for at least 24 hours. Open the doors and put some towels around it to let the frost melt out.
All the air that gets cooled in your unit gets cooled by a fan that pulls air through those coils. Once the frost has melted out of them it should cool just fine.

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