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My AC runs good, fan runs good but the air is not

My RV Roof AC runs good, fan runs good but the air is not cool. What is the problem for it? Do we need to replace it?

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You are probably low on refrigerant or your txv or metering device isn't working. If you have an orifice or captube then it's probably low on refrigerant.

Posted on Aug 25, 2009

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1 Answer

Dometic roof top rv ac not cooling


sounds like it is low on freon have someone check with gage and add more if nedded.

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Hi, Try this , Go on the roof and open the cover and cleanout any screens and filters you can find.
If this does not work seek a proffessional to look at it. Good luck.

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My Dometic Rv ac is not cooling but, the fan does run..


Can you give me the model number of your AC unit. There should be a sticker on the bottom of the upper (roof) unit, that you can see when you take the filter down from the ceiling inside. Also need to know if it's a wall thermostat and what brand/model, or are the controls at the ceiling.

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With power off, go on roof & try spinning fan at rear through cover with a stick, or something, until fan has made 2 or 3 revolutions, then try fan mode only & see if it starts. If no luck, remove cover on roof (watch for bees & wasps) and spin fan good by hand a few times & try again, if no luck, replace fan start capacitor.

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Go up on the roof of the unit and remove the AC Shroud. With the unit running, see if you can pinpoint where the sound is coming from. The only thing on the entire AC that would make that much of a vibration would be the fan motor. Not sure what would cause the fan motor to do this. The compressor may do that but only if the windings are bad and then it would not be cooling.

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Fan motor bearing getting hot and seizing on the shaft. Just changeout the fan motor...

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