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Old 09-22-2021, 09:50 AM   #1
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Atwood Furnace blower noise

I have a hydro flame 8500-IV series furnace in my 2002 Airstream MOTORHOME. While running, it sounds like the blower (fan) is loose somewhere. Kind of a rattling and chirping sound combined. Anyhoo..... is there an easy way to check if maybe the clamp is loose? Or hopefully something "easy" to get to (if there is such a thing on an RV).

If anyone has repaired or knows what the issue is, I'd really appreciate your sound advice.

Thank you.

PS: I'm a solo woman determined to fix my own equipment!
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Old 09-22-2021, 10:39 AM   #2
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I believe you are going to have to remove the furnace and open up the heat exchanger to get to the blower motor. What could be making the noise on that old of a unit is dry or worn out bearings in the fan motor. It could be out of balance due to a wasp nest or dirt build up but I suspect it's fan motor issues.
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Old 09-22-2021, 11:12 AM   #3
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I have the same series as yours and while on a trip the fan blew apart. Before hand their was a noise like something out of balance and mine probably was until it just broke apart. It's a squirrel cage looking fan and from outside of your coach if you open the door and look inside, you will see a black plastic semi round cover. Removing it you will see the fan. Rotate it by hand and look for broken blades, whether cracked or parts missing. Or, you might just see it broke without even touching it. I was in Phoenix and had to call a RV tech to fix it. I know how now. It is kind of tough to reach and you will need a long extension of sorts to remove small bolts and or screws maybe both, I forget now. The fan itself, at least on mine is just fitted over a collar with a large hose clamp. You have to reach around a corner to install a new one.
If it breaks while running, like mine. You have to open the vent intake door, inside your coach, and clean up plastic before running the furnace to make sure broken pieces don't get hung up with the new fan installed.
I see now someone else has responded and it looks to be good info for you as well. Keep us posted. I was just over to Deer Park this last weekend. I would of gone over to CDA to help you if the timing was right. Most folks probably don't know that CDA is Couer de Alane, ID. I just learned that, LOL
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Old 09-23-2021, 09:04 AM   #4
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Thanks so much for the info. Sounds like I need to find a technician, pronto. However, I'm in La Pine Oregon (1 hour south of Bend) and no one is willing to drive this far to help. I'm paid thru the 30th of this month; hopefully it will last another week!!?!
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Old 09-25-2021, 04:35 PM   #5
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IF it is the motor and a replacement is out of production you could take the old motor to an electric motor repair shop. They do work on large irrigation pumps to small hand tool type equipment. Good luck getting it fixed before it gets too cold. BTW, my son lives in Klamath Falls. So, I knew exactly where you are.
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Old 09-25-2021, 10:17 PM   #6
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Take off that half round plastic cover, then you can see fan and motor you can get a bit of wd40 into the bearings and that might put off the inevitable for a while. A new motor is in your future. Replacing the fan and motor is not that difficult and it is possible to do it without removing the furnace
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Old 09-27-2021, 10:26 AM   #7
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Miraculous Recovery (furnace)

I posted last week about my Atwood furnace making all sorts of noise; clunking, chirping, rattling. Kept me awake at night. I scheduled a mobile tech appointment... however, in the middle of the night, sound asleep, the furnace kicked on and made this horrible screeching and rattling sound; I sat straight up in bed. The noise finally settled down, I slept the rest of the night, and low and behold, NO MORE NOISE. The recovery was a miracle! LOL!

I'm quite sure it was a mouse. I have bait in the basement, and they've nibbled on it. I think, as the mouse dried out, the noise changed in the blower, and then, the blower finally just blew him out! Crazy!
I still have the appointment with the mobile tech, just in case it is something else.

Just thought you'd wanna know!
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Old 09-28-2021, 09:05 AM   #8
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Thanks for the update. If things change for the worse please let us know. Years ago in the house fridge a mouse got trapped between the fan and housing. It's been too long to remember the specifics. I removed him and all sounded well again.
Yeah, a miracle huh. I hope that does it for you. Good Luck.
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