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Roof A/C problem
One of my roof airs made kind of a whistling noise last night while it was on. The fan was blowing fairly slow. I turned it off then back on just to confirm it was coming from the A/C then I just turned it off for the night. This morning I tested it and I can hear it kick in but the fan won’t blow. I climbed up on the roof and took the cover off of 3 of the A/C’s including the culprit. When you spin the fan on the one that made the noise the fan does not spin as free as the other two and you can hear the whistling when you spin it. Do I just have a fan motor that’s gone bad?
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4 Replies
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Dean,
Sure sounds like the sleve bearings in the motor are seizing. When mine did that, I soaked the shafts at the motor ends where the bearings are located with CorrosionX and rotated them to allow some CorrosionX to enter the bearing and begin to free them up. When they spun more freely, I had the wife turn the fan on and added some more CorrosionX. This lasted for another year. corrosionx.com
I have replaced my roof A/Cs with the Atwood 15k btu heatpumps. They have two motors, are very quiet, have a “Dry” dehummidify mode, an auto mode that shifts from cool to heat depending on what is needed to get to set point and a number of nice features such as built-in ductwork that turns the downward moving air to horizontal smoothly.
You can of course replace the fan motor in your unit. I replaced my A/Cs because I liked the very quiet Atwoods. My total cost for two A/Cs was $1338 from the 12volt store on line. I installed them is 30 minutes each using a friends forklift. Two new fan motors professionally installed had cost me $540.
A friend has ordered three for his Prevost.
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Dean
I had the same problem in my 04 xl2 the problem was the fan, it broke causing scraping noise, Marathon st Antonio replaced the and all was good again. Before I replace the A/C I would have a good A/C shop test it and go from there. -
Thanks. I don’t think the entire unit will have to be replaced. Most likely like you said it’s just the fan motor.
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dean
my motor on my doutherm penguin just gave out. A need a replacement motor ASAP. Did you get yore fixed? If so, where did you get your motor from?
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