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I have a rudd acheiver 10 ac unit..the outside fan seizes up..i have wd40'd it, it will spin for a while the seize up again...how can i fix this issue? how does the fan motor come apart? is it permanently sealed? do i need to replace it?

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Yes the bearing in the motor are bad

Posted on Sep 03, 2010

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Hi' I have a coleman roof top AC unit on a 1991 Tioga i just purchused a couple of months ago! When i turn on the AC it makes a humming sound...no fans spin or no air comes out! If i let it hum for...


Hi,
The blower motor is seized up...you will need to get up top and remove the cover...then remove the fan blades and the motor and replace the motor....sometimes a temp. fix will be to get WD-40 and then oil worked into the bearings...but that is usually a very short lived fix...
Replacing the motor can be frustrating and time consuming, so you may want to hire someone to do it for you...you may also find that a replacement unit is more cost effective..

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My laptop not working power cut off afet 10 to 15 minutes the fan is working but outside of air warm air. pl give solution.


An overheating problem will cause the CPU to shut down and if this is not fixed then eventually the CPU will fail. Check the fan to see if it spins freely, also check the heatsink and fan assemble to see if it is clogged with dust, if so loosen the dust and vacuum to remove the dust. If the fan does not spin, then the fan bearing has seized up and the fan needs to be replaced.

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My AC is running inside but the outside unit is not.


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Air conditioning unit seized up and burt the belt.


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My RV rooftop air conditioner fan has seized up


Whether to replace the entire unit or repair it is a tough decision. If the unit is not very old and was working fine before the fan motor froze up, then I do not think that it is necessary for the entire unit to be replaced. With a new unit of course comes the new warranty.

It is not difficult at all to replace the upper unit of the air conditioner. What you have to look for and make sure of is that the ceiling pack or Air Distribution Box (inside unit of AC) that you currently have is compatible with the new Upper Units. Get the part number off of the inner unit and make sure that it is compatible with the part number of the new upper.

Again, it is much less expensive to replace the fan motor than the entire unit (especially Dometic). You could replace the fan motor and get another 10 years out of the AC or, you could replace it and only get 1 year out of it. That is your call.

Just a word of precaution. Dometic Air Conditioners are very hard to find right now due to an industrial accident that occurred at the AC plant. Most distributors and service centers are 6 to 8 weeks out on getting a Dometic AC in stock. That is something else to think about.

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When you turn on the airconditoning.the outside unit just makes a humming noise but does not work, This is a mobile home unit.


First disconnect the power to the unit. The motor may have seized up. Depending on how old the unit is. If the fan does not spin freely after you remove the top of the unit. You may have to replace the fan motor.............

May 06, 2009 | Heating & Cooling

1 Answer

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Feel the motor and see if hes hot ...... spin the fan by hand and see if it spins freely  if not the bearings have seized up.   So either rebuild the fan motor simply by replacing the bearings and oiling them and that should fix your problem.    IF the fan spins freely   OHM out the fan  and make sure there is no shorts or openings in the fan.     if your fan motor checks out good both mechanically and electrically  then your next step is to check the capacitor and control board

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