Heater blower/fan high pitch whine

2006 LEXUS LX 470
92,000 MILES • 4.7L • V8 • AWD • AUTOMATIC
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TXJTEBBE
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  • 1 POST
I am hearing a high pitch whine from beneath the glove box when the heater blower is turned on. The sound is not heard when on highest speed (probably because the fan is making too much noise).

I just replaced the motor/blower thinking it was a bearing going bad, but it did not help. The sound almost reminds me of the whine from a car stereo amp that is poorly grounded.

Any thoughts on what the problem is?

Thanks!
Dec 30, 2013 at 11:55 AM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
This sounds like a blower motor speed controller that is going out. Here is the location so you can check it out.

Check out the diagrams (below).

Please let us know what happens.

Cheers
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Dec 30, 2013 at 12:55 PM
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GBBERN12
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I had this problem with my car and the controller fixed it. thanks for the diagram. :)
Apr 22, 2018 at 12:10 PM
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