Blower motor makes a vibrating sound when the fan is set on high

1992 OLDSMOBILE 88
100,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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DONALD PETERSON2
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Today, I replaced my uncle's blower motor for the second time. The fan had broken to bits, probably got cracked trying to wedge that sucker in there! That's a tight fit. The problem I need advice about isn't the broken fan, but the fact that the blower motor makes a vibrating sound when the fan is set on high. It kind of sounds like the fan may be touching something, but I don't think that's the case, because it would make the noise on any speed setting, right? It happened with the previous new motor, and I think it's unlikely that both motors were defective. The voltage on it is 12 volts. I'm wondering if the car, being as old as it is, may need a higher voltage. I don't know what the original motor's voltage was, I didn't think to check. Now I wish I had. So, if anyone can clear this up, I'd be very grateful.
Jan 13, 2019 at 1:42 PM
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ASEMASTER6371
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Good afternoon,

Did you replace the cage with the motors? it sounds like it is out of balance.

Are you using new motors?

Roy
Jan 13, 2019 at 2:28 PM
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DONALD PETERSON2
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The motors are new. By CAGE, you mean the cylindrical fan? Don't laugh! lol I think the screws may be stripped out. The balance theory sounds about right. I thought they weren't tightening enough, and it seemed to never tighten when I got the gasket on.
Jan 14, 2019 at 11:20 AM
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ASEMASTER6371
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Yep, make sure the motor is secure or it will vibrate all over the place.

Roy
Jan 14, 2019 at 11:32 AM