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I have a rooftop unit 10tons when i turn the fan on it makes a rubbing sound i remover the fan and the motor the motor make no noise I changed the berrings in the fan but it still makes the loud rubbing sound

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The unit may settled and it is rubbing against something it may be the the unit on low and see then to high that may lead you to the location good luck

Posted on Sep 08, 2009


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How hard is it to change a fan motor in rooftop rv

like changing a window unit fan motor after you remove cover on roof.

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Those squirrel cage fans have a habit of coming apart, or getting dirt in them and going out of balance...then they wobble and hit the sides of the fan housing...
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Mar 06, 2011 | Dometic Rooftop RV Air Conditioner

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When i turn my ac on all i get is a hum noise no fan etc

to me it sounds like u have a bad fan motor.Remove inside cover to access fan motor. Check fan to be sure blades move freely Turn on for a min.turn off and feel the motor.If its warm.then i would. replace it..That is agood sign the motor is bad.The other way is to test power at the fan by power supply leads.remove 1 side of supply, using a volt meter clip to the wire an clip other lead to motor or to frame
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Jan 21, 2011 | Dometic Rooftop RV Air Conditioner

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Aug 10, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a wilderness 24ft rv with a colmen air.I have ceilind duck work.what I need e-mailed to me is how to change the motor on the roor.the shaft to the motor is bent.have new motor and fan

Changing the motor is not as difficult as you may think. From the roof, remove the outer shroud of the unit.

1. Remove the front evaporator cover (phillips screws along the edge).
2. Remove the condenser cover from the rear
3. With a 1/8" Allen Wrench, remove the condenser fan. CAUTION, be sure to pay particular attention to the way the fan turns.
4. With the same wrench, remove the blower fan. Again, pay attention to the orientation of the fan.
***If the fans are "stuck" to the shaft, it may be easier to remove the entire unit and place it on a bench to remove them. Secure the fan with a couple of blocks of wood and tap the end of the shaft with a punch and hammer.
5. Remove the nuts holding the fan motor to the separator plate (may have to pull back black foam pad to access. Remove the nut holding the fan to the support.
6. Cut the wires to the motor at the electrical connectors (located inside access panel on side of unit).
7. Remove the two brown wires from the capacitor
8. Re-install the new unit opposite of removal. Pay attention to where the fans were located on the shafts so that they do not rub when you put the unit back together.

Hope this helps,


Jun 23, 2009 | Dometic Rooftop RV Air Conditioner

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RV Rooftop AC Unit

Sounds to me like your fan is hitting something
Remove the cover and turn the fan by hand ( with the power off ! ) See what it is hitting

Oct 24, 2008 | Dometic Rooftop RV Air Conditioner

3 Answers

Lous Noise

It could be the blower fan is loose and needs to be tightened. If so, and you're handy, shouldn't be too difficult. Depends on the specific design.

Jun 16, 2007 | Kenmore 72175 Air Conditioner

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