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Old 05-24-2011, 07:33 AM   #1
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1972 27' Overlander
Owasso , Oklahoma
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'72 Overlander AC fan hums when off

My AC on my 72 overlander works great, but the outside fan just barely hums when it is turned off unless you turn off the breaker.
Any ideas what the problem is?

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Old 05-24-2011, 08:50 AM   #2
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Sounds like the relay that switches it from start to run is not disconnecting the run winding when it should.

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Old 05-24-2011, 08:52 AM   #3
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Old 05-24-2011, 09:17 AM   #4
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Originally Posted by JollyGreen View Post
My AC on my 72 overlander works great, but the outside fan just barely hums when it is turned off unless you turn off the breaker.
Any ideas what the problem is?
I think you will find that a 24 volt AC transformer is humming, and not the fan.

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Old 05-24-2011, 11:01 AM   #5
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1972 25' Tradewind
Albany , Georgia
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I had a similar issue with my 72 trade wind. It turned out that one of the windings on the motor was bad. My symptoms were that the blower motor was actually running with the ac off. I thought I had discovered perpetual motion. I even took a video of the motor running with the neutral wire disconnected.
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