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Old 11-29-2021, 03:00 PM   #1
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Suburban Furnace Model SF-42F fan squealing

Hi all.... hope everyone had a great Thanksgiving!

In my 2000 Monaco Windsor I have a Suburban model SF-42F furnace and the fan blower motor squeals fairly significantly. Anyone have advice on a fix for this? Does the entire furnace assembly need to be removed from underneath the fridge? Looking at it.... I am assuming so. Also assuming I will need to replace the fan motor.

Any help would again be appreciated. Thanks!
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Old 11-29-2021, 03:10 PM   #2
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Some of these motors can be oiled. It might be just as easy as adding some oil to the shaft near the bearings. Also, sometimes the motor can be disassembled, cleaned, and reinstalled. At the very least, replacement parts are available. Good luck, and let us know how it goes (with pictures!)
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Old 12-20-2021, 09:14 AM   #3
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I assume my only option is to completely remove the furnace from the compartment underneath the fridge? This looks like a fairly involved project!
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Old 12-20-2021, 09:25 AM   #4
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Sf-30 and sf-42 are similar.. yes.. after 22yrs.. time for fan.. and maintenance.. I am in same boat.. I have 2000 sf-35..? So anyway.. if you are going to do repair..
Check you tube.. there are many vids.. luckily these are easy to repair..
Let us know if you plan to do yourself.. or if you plan to have a shop do it..
Good luck and let us know what you did and maybe better members then me will help you
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Old 12-20-2021, 09:27 AM   #5
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YES.....
Suburban Furnace requires removal from compartment in order to access components
Once out...replace the motor
(motor uses bushing vs bearings.....squealing/bushing worn)

2 different motors were used based on S/N of furnace (2 1/2" motor & 3" motor)
See Item #40
https://pdxrvwholesale.com/products/...2f-tune-up-kit
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Old 12-20-2021, 10:17 AM   #6
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Good luck on removing, you will be working blind most of the time.


I installed a residential refrigerator and when I had everything gutted I went ahead and gave the furnace a good once over, we seldom use ours so it didn't appear the motor was in bad shape.

If yours was installed similar to mine you will have to turn off the propane and disconnect. On mine the connection was on the side toward the rear of the coach and then a connection was run under it to feed the refrigerator. I completely removed this length of copper so I could drop the furnace to the floor to gain 1 5/8" height.
All the wiring is also on that side, on mine all with wires were spliced, I could remove some off the circuit board but had to cut and resplice back together the ones I couldn't. Hard enough working with an open area, will be harder working under the fridge.

Here's a picture of the furnace after I dropped it to the floor and hooked everything back up. The conduit strut is the support legs I installed to put the refrigerator in, I didn't put a floor/shelf back in. If I every have to work on the furnace I'll have to remove the refrigerator.
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Old 12-20-2021, 10:54 AM   #7
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I replaced both of my furnace blower motors by removing the outside cover. As mentioned utube has videos showing how. Squirrel cage blower came off easy, but the exhaust blowers never came off. Had to break them to get off and then replace.
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Old 12-20-2021, 11:01 AM   #8
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Quote:
Originally Posted by maint1 View Post
I replaced both of my furnace blower motors by removing the outside cover. As mentioned utube has videos showing how. Squirrel cage blower came off easy, but the exhaust blowers never came off. Had to break them to get off and then replace.
Must have been an Atwood Model

OP has Suburban which doesn't have an exterior access panel
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