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Old 04-10-2015, 08:34 PM   #1
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1990 29' Excella
baltimore , Maryland
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high frequency squeal when furnace comes on

So I am thinking it is the furnace blower motor?
It only lasts for a few moments.
Is there a fix?
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Old 04-10-2015, 08:41 PM   #2
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If it only lasts a few moments, I doubt it is the motor bearings. Probably the fun is rubbing briefly.

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Old 04-10-2015, 10:03 PM   #3
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The fan motors are replaceable.


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Old 04-11-2015, 12:18 AM   #4
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My guess is that the fan motor bushings are dry.

If it was mine I would remove the fan motor, disassemble, and clean and lubricate the motor bushings.

By doing so you will likely extend the life of the motor for a long time.


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Old 04-11-2015, 04:59 AM   #5
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I had the same problem with my 77. Taking it apart and lubricating the fan motor got it to last another 3 years. When it started again I replaced the motor.
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Old 04-11-2015, 01:33 PM   #6
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1988 25' Excella
Santa Rosa , California
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Happened to me too! Fan motor will get worse and worse until it's unbearable (think 2AM). Cut to the chase have the motor removed and rebuilt. Not necessary to replace the obsolete furnace.
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Old 04-11-2015, 07:12 PM   #7
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Penokee , Kansas
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Hello Groundhogy.. Welcome to the group..

Our 72 Overlander blower motor screamed when ever it turned on.. I pulled the unit out onto some old carpet so not to damage the floor and tore it all apart and cleaned everything up.. I used a very high grade turbine oil on the motor bearings and it runs like a new furnace for the past 2 years.

I love old tech for this reason.. Clean,, adjust,, and oil and it will be good for another 40 years.. No computer boards,, micro switches,, or other items outdated and made overseas

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Old 04-11-2015, 09:05 PM   #8
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Quote:
Originally Posted by Sodbust View Post
Hello Groundhogy.. Welcome to the group..

Our 72 Overlander blower motor screamed when ever it turned on.. I pulled the unit out onto some old carpet so not to damage the floor and tore it all apart and cleaned everything up.. I used a very high grade turbine oil on the motor bearings and it runs like a new furnace for the past 2 years.

I love old tech for this reason.. Clean,, adjust,, and oil and it will be good for another 40 years.. No computer boards,, micro switches,, or other items outdated and made overseas

Sodbust

Bingo!!!


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Old 04-12-2015, 11:44 AM   #9
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1978 25' Tradewind
Superior , Montana
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hello Groundhogy
I had the same problem on 1978 Safari took the furnace out and cleaned the complete furnace removed all the dust and rust and lubricated the fan motor bearings. I agree with J Morgan and sodbust to fix.
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